{"id":185,"date":"2016-01-22T16:49:22","date_gmt":"2016-01-22T08:49:22","guid":{"rendered":"http:\/\/www.zhuyanbin.com\/?p=185"},"modified":"2016-01-22T16:49:22","modified_gmt":"2016-01-22T08:49:22","slug":"photokit-%e8%af%a6%e8%a7%a3%ef%bc%88%e4%b8%8b%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.yanbin888.com\/?p=185","title":{"rendered":"PhotoKit \u8be6\u89e3\uff08\u4e0b\uff09"},"content":{"rendered":"

\u4e09. \u5e38\u7528\u65b9\u6cd5\u7684\u5c01\u88c5<\/h2>\n

\u867d\u7136 PhotoKit \u7684\u529f\u80fd\u5f3a\u5927\u5f88\u591a\uff0c\u4f46\u57fa\u4e8e\u517c\u5bb9 iOS 8.0 \u4ee5\u4e0b\u7248\u672c\u7684\u8003\u8651\uff0c\u6682\u65f6\u53ef\u80fd\u4ecd\u65e0\u6cd5\u629b\u5f03 ALAssetLibrary\uff0c\u8fd9\u65f6\u5019\u4e00\u4e2a\u6bd4\u8f83\u597d\u7684\u65b9\u6848\u662f\u57fa\u4e8e ALAssetLibrary \u548c PhotoKit \u5c01\u88c5\u51fa\u4e00\u7cfb\u5217\u6a21\u62df\u7cfb\u7edf Asset \u7c7b\u7684\u81ea\u5b9a\u4e49\u7c7b\uff0c\u7136\u540e\u5728\u5176\u4e2d\u5c01\u88c5\u597d\u517c\u5bb9 ALAssetLibrary \u548c PhotoKit \u7684\u65b9\u6cd5\u3002<\/p>\n

\u8fd9\u91cc\u5217\u4e3e\u4e86\u56db\u79cd\u5e38\u7528\u7684\u5c01\u88c5\u597d\u7684\u65b9\u6cd5\uff1a\u539f\u56fe\uff0c\u7f29\u7565\u56fe\uff0c\u9884\u89c8\u56fe\uff0c\u65b9\u5411\uff0c\u4e0b\u9762\u76f4\u63a5\u4e0a\u4ee3\u7801\uff0c\u4ee3\u7801\u4e2d\u6709\u76f8\u5173\u6ce8\u91ca\u89e3\u91ca\u5176\u4e2d\u7684\u8981\u70b9\u3002\u5176\u4e2d\u4e0b\u9762\u7684\u4ee3\u7801\u4e2d\u5e38\u5e38\u51fa\u73b0\u7684\u00a0[[QMUIAssetsManager sharedInstance] phCachingImageManager] \u662f QMUI \u6846\u67b6\u4e2d\u5c01\u88c5\u7684\u7c7b\u4ee5\u53ca\u5355\u4f8b\u65b9\u6cd5\uff0c\u8868\u793a\u4ea7\u751f\u4e00\u4e2a\u00a0PHCachingImageManager \u7684\u5355\u4f8b\uff0c\u8fd9\u6837\u505a\u7684\u597d\u5904\u662f\u00a0PHCachingImageManager \u9700\u8981\u5360\u7528\u8f83\u591a\u7684\u8d44\u6e90\uff0c\u56e0\u6b64\u4f7f\u7528\u5355\u4f8b\u53ef\u4ee5\u907f\u514d\u65e0\u8c13\u7684\u8d44\u6e90\u6d88\u8017\uff0c\u53e6\u5916\u8bf7\u6c42\u56fe\u50cf\u7b49\u65b9\u6cd5\u9700\u8981\u57fa\u4e8e\u7528\u4e00\u4e2a\u00a0PHCachingImageManager \u5b9e\u4f8b\u624d\u80fd\u8fdb\u884c\u8fdb\u5ea6\u7eed\u4f20\uff0c\u7ba1\u7406\u8bf7\u6c42\u7b49\u64cd\u4f5c\u3002<\/p>\n

1. \u539f\u56fe<\/h3>\n

\u7531\u4e8e\u539f\u56fe\u7684\u5c3a\u5bf8\u901a\u5e38\u4f1a\u6bd4\u8f83\u5927\uff0c\u56e0\u6b64\u5efa\u8bae\u4f7f\u7528\u5f02\u6b65\u62c9\u53d6\uff0c\u4f46\u8fd9\u91cc\u4ecd\u540c\u65f6\u5217\u4e3e\u540c\u6b65\u62c9\u53d6\u7684\u65b9\u6cd5\u3002\u8fd9\u91cc\u9700\u8981\u7559\u610f\u5982\u524d\u6587\u4e2d\u6240\u8ff0\uff0cALAssetRepresentation \u4e2d\u83b7\u53d6\u539f\u56fe\u7684\u63a5\u53e3\u00a0fullResolutionImage \u6240\u5f97\u5230\u7684\u56fe\u50cf\u5e76\u6ca1\u6709\u5e26\u4e0a\u7cfb\u7edf\u76f8\u518c\u201c\u7f16\u8f91\u201d\uff08\u9009\u4e2d\uff0c\u6ee4\u955c\u7b49\uff09\u7684\u6548\u679c\uff0c\u9700\u8981\u989d\u5916\u83b7\u53d6\u8fd9\u4e9b\u6548\u679c\u5e76\u624b\u5de5\u53e0\u52a0\u5230\u56fe\u50cf\u4e0a\u3002<\/p>\n

.h \u6587\u4ef6<\/p>\n

\n
\/\/\/ Asset \u7684\u539f\u56fe\uff08\u5305\u542b\u7cfb\u7edf\u76f8\u518c\u201c\u7f16\u8f91\u201d\u529f\u80fd\u5904\u7406\u540e\u7684\u6548\u679c\uff09
\n– (UIImage *)originImage;<\/p>\n

\/**
\n*\u00a0 \u5f02\u6b65\u8bf7\u6c42 Asset \u7684\u539f\u56fe\uff0c\u5305\u542b\u4e86\u7cfb\u7edf\u7167\u7247\u201c\u7f16\u8f91\u201d\u529f\u80fd\u5904\u7406\u540e\u7684\u6548\u679c\uff08\u526a\u88c1\uff0c\u65cb\u8f6c\u548c\u6ee4\u955c\u7b49\uff09\uff0c\u53ef\u80fd\u4f1a\u6709\u7f51\u7edc\u8bf7\u6c42
\n*
\n*\u00a0 @param completion\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u5b8c\u6210\u8bf7\u6c42\u540e\u8c03\u7528\u7684 block\uff0c\u53c2\u6570\u4e2d\u5305\u542b\u4e86\u8bf7\u6c42\u7684\u539f\u56fe\u4ee5\u53ca\u56fe\u7247\u4fe1\u606f\uff0c\u5728 iOS 8.0 \u6216\u4ee5\u4e0a\u7248\u672c\u4e2d\uff0c
\n*\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd9\u4e2a block \u4f1a\u88ab\u591a\u6b21\u8c03\u7528\uff0c\u5176\u4e2d\u7b2c\u4e00\u6b21\u8c03\u7528\u83b7\u53d6\u5230\u7684\u5c3a\u5bf8\u5f88\u5c0f\u7684\u4f4e\u6e05\u56fe\uff0c\u7136\u540e\u4e0d\u65ad\u8c03\u7528\uff0c\u76f4\u63a5\u83b7\u53d6\u5230\u9ad8\u6e05\u56fe\uff0c
\n*\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u83b7\u53d6\u5230\u9ad8\u6e05\u56fe\u540e QMUIAsset \u4f1a\u7f13\u5b58\u8d77\u8fd9\u5f20\u9ad8\u6e05\u56fe\uff0c\u8fd9\u65f6 block \u4e2d\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff08\u56fe\u7247\u4fe1\u606f\uff09\u8fd4\u56de\u7684\u4e3a nil\u3002
\n*\u00a0 @param phProgressHandler \u5904\u7406\u8bf7\u6c42\u8fdb\u5ea6\u7684 handler\uff0c\u4e0d\u5728\u4e3b\u7ebf\u7a0b\u4e0a\u6267\u884c\uff0c\u5728 block \u4e2d\u4fee\u6539 UI \u65f6\u6ce8\u610f\u9700\u8981\u624b\u5de5\u653e\u5230\u4e3b\u7ebf\u7a0b\u5904\u7406\u3002
\n*
\n*\u00a0 @wraning iOS 8.0 \u4ee5\u4e0b\u4e2d\u5e76\u6ca1\u6709\u5f02\u6b65\u8bf7\u6c42\u9884\u89c8\u56fe\u7684\u63a5\u53e3\uff0c\u56e0\u6b64\u5b9e\u9645\u4e0a\u4e3a\u540c\u6b65\u8bf7\u6c42\uff0c\u8fd9\u65f6 block \u4e2d\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff08\u56fe\u7247\u4fe1\u606f\uff09\u8fd4\u56de\u7684\u4e3a nil\u3002
\n*
\n*\u00a0 @return \u8fd4\u56de\u8bf7\u6c42\u56fe\u7247\u7684\u8bf7\u6c42 id
\n*\/
\n– (NSInteger)requestOriginImageWithCompletion:(void (^)(UIImage *, NSDictionary *))completion withProgressHandler:(PHAssetImageProgressHandler)phProgressHandler;<\/p><\/div>\n

<\/div>\n<\/div>\n

.m \u6587\u4ef6<\/p>\n

\n
– (UIImage *)originImage {
\nif (_originImage) {
\nreturn _originImage;
\n}
\n__block UIImage *resultImage;
\nif (_usePhotoKit) {
\nPHImageRequestOptions *phImageRequestOptions = [[PHImageRequestOptions alloc] init];
\nphImageRequestOptions.synchronous = YES;
\n[[[QMUIAssetsManager sharedInstance] phCachingImageManager] requestImageForAsset:_phAsset
\ntargetSize:PHImageManagerMaximumSize
\ncontentMode:PHImageContentModeDefault
\noptions:phImageRequestOptions
\nresultHandler:^(UIImage *result, NSDictionary *info) {
\nresultImage = result;
\n}];
\n} else {
\nCGImageRef fullResolutionImageRef = [_alAssetRepresentation fullResolutionImage];
\n\/\/ \u901a\u8fc7 fullResolutionImage \u83b7\u53d6\u5230\u7684\u7684\u9ad8\u6e05\u56fe\u5b9e\u9645\u4e0a\u5e76\u4e0d\u5e26\u4e0a\u5728\u7167\u7247\u5e94\u7528\u4e2d\u4f7f\u7528\u201c\u7f16\u8f91\u201d\u5904\u7406\u7684\u6548\u679c\uff0c\u9700\u8981\u989d\u5916\u5728 AlAssetRepresentation \u4e2d\u83b7\u53d6\u8fd9\u4e9b\u4fe1\u606f
\nNSString *adjustment = [[_alAssetRepresentation metadata] objectForKey:@”AdjustmentXMP”];
\nif (adjustment) {
\n\/\/ \u5982\u679c\u6709\u5728\u7167\u7247\u5e94\u7528\u4e2d\u4f7f\u7528\u201c\u7f16\u8f91\u201d\u6548\u679c\uff0c\u5219\u9700\u8981\u83b7\u53d6\u8fd9\u4e9b\u7f16\u8f91\u540e\u7684\u6ee4\u955c\uff0c\u624b\u5de5\u53e0\u52a0\u5230\u539f\u56fe\u4e2d
\nNSData *xmpData = [adjustment dataUsingEncoding:NSUTF8StringEncoding];
\nCIImage *tempImage = [CIImage imageWithCGImage:fullResolutionImageRef];<\/p>\n

NSError *error;
\nNSArray *filterArray = [CIFilter filterArrayFromSerializedXMP:xmpData
\ninputImageExtent:tempImage.extent
\nerror:&error];
\nCIContext *context = [CIContext contextWithOptions:nil];
\nif (filterArray && !error) {
\nfor (CIFilter *filter in filterArray) {
\n[filter setValue:tempImage forKey:kCIInputImageKey];
\ntempImage = [filter outputImage];
\n}
\nfullResolutionImageRef = [context createCGImage:tempImage fromRect:[tempImage extent]];
\n}
\n}
\n\/\/ \u751f\u6210\u6700\u7ec8\u8fd4\u56de\u7684 UIImage\uff0c\u540c\u65f6\u628a\u56fe\u7247\u7684 orientation \u4e5f\u8865\u5145\u4e0a\u53bb
\nresultImage = [UIImage imageWithCGImage:fullResolutionImageRef scale:[_alAssetRepresentation scale] orientation:(UIImageOrientation)[_alAssetRepresentation orientation]];
\n}
\n_originImage = resultImage;
\nreturn resultImage;
\n}<\/p>\n

– (NSInteger)requestOriginImageWithCompletion:(void (^)(UIImage *, NSDictionary *))completion withProgressHandler:(PHAssetImageProgressHandler)phProgressHandler {
\nif (_usePhotoKit) {
\nif (_originImage) {
\n\/\/ \u5982\u679c\u5df2\u7ecf\u6709\u7f13\u5b58\u7684\u56fe\u7247\u5219\u76f4\u63a5\u62ff\u7f13\u5b58\u7684\u56fe\u7247
\nif (completion) {
\ncompletion(_originImage, nil);
\n}
\nreturn 0;
\n} else {
\nPHImageRequestOptions *imageRequestOptions = [[PHImageRequestOptions alloc] init];
\nimageRequestOptions.networkAccessAllowed = YES; \/\/ \u5141\u8bb8\u8bbf\u95ee\u7f51\u7edc
\nimageRequestOptions.progressHandler = phProgressHandler;
\nreturn [[[QMUIAssetsManager sharedInstance] phCachingImageManager] requestImageForAsset:_phAsset targetSize:PHImageManagerMaximumSize contentMode:PHImageContentModeDefault options:imageRequestOptions resultHandler:^(UIImage *result, NSDictionary *info) {
\n\/\/ \u6392\u9664\u53d6\u6d88\uff0c\u9519\u8bef\uff0c\u4f4e\u6e05\u56fe\u4e09\u79cd\u60c5\u51b5\uff0c\u5373\u5df2\u7ecf\u83b7\u53d6\u5230\u4e86\u9ad8\u6e05\u56fe\u65f6\uff0c\u628a\u8fd9\u5f20\u9ad8\u6e05\u56fe\u7f13\u5b58\u5230 _originImage \u4e2d
\nBOOL downloadFinined = ![[info objectForKey:PHImageCancelledKey] boolValue] && ![info objectForKey:PHImageErrorKey] && ![[info objectForKey:PHImageResultIsDegradedKey] boolValue];
\nif (downloadFinined) {
\n_originImage = result;
\n}
\nif (completion) {
\ncompletion(result, info);
\n}
\n}];
\n}
\n} else {
\nif (completion) {
\ncompletion([self originImage], nil);
\n}
\nreturn 0;
\n}
\n}<\/p><\/div>\n<\/div>\n

\u00a02.\u00a0\u7f29\u7565\u56fe<\/h3>\n

\u76f8\u5bf9\u4e8e\u5728\u62c9\u53d6\u539f\u56fe\u65f6 ALAssetLibrary \u7684\u90e8\u5206\u9700\u8981\u624b\u5de5\u53e0\u52a0\u7cfb\u7edf\u76f8\u518c\u7684\u201c\u7f16\u8f91\u201d\u6548\u679c\uff0c\u62c9\u53d6\u7f29\u7565\u56fe\u5219\u7b80\u5355\u4e00\u4e9b\uff0c\u56e0\u4e3a\u7cfb\u7edf\u63a5\u53e3\u62c9\u53d6\u5230\u7684\u7f29\u7565\u56fe\u5df2\u7ecf\u5e26\u4e0a\u201c\u7f16\u8f91\u201d\u7684\u6548\u679c\u4e86\u3002<\/p>\n

.h \u6587\u4ef6<\/p>\n

\n
\/**
\n* Asset \u7684\u7f29\u7565\u56fe
\n*
\n* @param size \u6307\u5b9a\u8fd4\u56de\u7684\u7f29\u7565\u56fe\u7684\u5927\u5c0f\uff0c\u4ec5\u5728 iOS 8.0 \u53ca\u4ee5\u4e0a\u7684\u7248\u672c\u6709\u6548\uff0c\u5176\u4ed6\u7248\u672c\u5219\u8c03\u7528 ALAsset \u7684\u63a5\u53e3\u7531\u7cfb\u7edf\u8fd4\u56de\u4e00\u4e2a\u5408\u9002\u5f53\u524d\u5e73\u53f0\u7684\u56fe\u7247
\n*
\n* @return Asset \u7684\u7f29\u7565\u56fe
\n*\/
\n– (UIImage *)thumbnailWithSize:(CGSize)size;<\/p>\n

\/**
\n* \u5f02\u6b65\u8bf7\u6c42 Asset \u7684\u7f29\u7565\u56fe\uff0c\u4e0d\u4f1a\u4ea7\u751f\u7f51\u7edc\u8bf7\u6c42
\n*
\n* @param size \u6307\u5b9a\u8fd4\u56de\u7684\u7f29\u7565\u56fe\u7684\u5927\u5c0f\uff0c\u4ec5\u5728 iOS 8.0 \u53ca\u4ee5\u4e0a\u7684\u7248\u672c\u6709\u6548\uff0c\u5176\u4ed6\u7248\u672c\u5219\u8c03\u7528 ALAsset \u7684\u63a5\u53e3\u7531\u7cfb\u7edf\u8fd4\u56de\u4e00\u4e2a\u5408\u9002\u5f53\u524d\u5e73\u53f0\u7684\u56fe\u7247
\n* @param completion \u5b8c\u6210\u8bf7\u6c42\u540e\u8c03\u7528\u7684 block\uff0c\u53c2\u6570\u4e2d\u5305\u542b\u4e86\u8bf7\u6c42\u7684\u7f29\u7565\u56fe\u4ee5\u53ca\u56fe\u7247\u4fe1\u606f\uff0c\u5728 iOS 8.0 \u6216\u4ee5\u4e0a\u7248\u672c\u4e2d\uff0c\u8fd9\u4e2a block \u4f1a\u88ab\u591a\u6b21\u8c03\u7528\uff0c
\n* \u5176\u4e2d\u7b2c\u4e00\u6b21\u8c03\u7528\u83b7\u53d6\u5230\u7684\u5c3a\u5bf8\u5f88\u5c0f\u7684\u4f4e\u6e05\u56fe\uff0c\u7136\u540e\u4e0d\u65ad\u8c03\u7528\uff0c\u76f4\u63a5\u83b7\u53d6\u5230\u9ad8\u6e05\u56fe\uff0c\u83b7\u53d6\u5230\u9ad8\u6e05\u56fe\u540e QMUIAsset \u4f1a\u7f13\u5b58\u8d77\u8fd9\u5f20\u9ad8\u6e05\u56fe\uff0c
\n* \u8fd9\u65f6 block \u4e2d\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff08\u56fe\u7247\u4fe1\u606f\uff09\u8fd4\u56de\u7684\u4e3a nil\u3002
\n*
\n* @return \u8fd4\u56de\u8bf7\u6c42\u56fe\u7247\u7684\u8bf7\u6c42 id
\n*\/
\n– (NSInteger)requestThumbnailImageWithSize:(CGSize)size completion:(void (^)(UIImage *, NSDictionary *))completion;<\/p><\/div>\n

<\/div>\n<\/div>\n

.m \u6587\u4ef6<\/p>\n

\n
– (UIImage *)thumbnailWithSize:(CGSize)size {
\nif (_thumbnailImage) {
\nreturn _thumbnailImage;
\n}
\n__block UIImage *resultImage;
\nif (_usePhotoKit) {
\nPHImageRequestOptions *phImageRequestOptions = [[PHImageRequestOptions alloc] init];
\nphImageRequestOptions.resizeMode = PHImageRequestOptionsResizeModeExact;
\n\/\/ \u5728 PHImageManager \u4e2d\uff0ctargetSize \u7b49 size \u90fd\u662f\u4f7f\u7528 px \u4f5c\u4e3a\u5355\u4f4d\uff0c\u56e0\u6b64\u9700\u8981\u5bf9targetSize \u4e2d\u5bf9\u4f20\u5165\u7684 Size \u8fdb\u884c\u5904\u7406\uff0c\u5bbd\u9ad8\u5404\u81ea\u4e58\u4ee5 ScreenScale\uff0c\u4ece\u800c\u5f97\u5230\u6b63\u786e\u7684\u56fe\u7247
\n[[[QMUIAssetsManager sharedInstance] phCachingImageManager] requestImageForAsset:_phAsset
\ntargetSize:CGSizeMake(size.width * ScreenScale, size.height * ScreenScale)
\ncontentMode:PHImageContentModeAspectFill options:phImageRequestOptions
\nresultHandler:^(UIImage *result, NSDictionary *info) {
\nresultImage = result;
\n}];
\n} else {
\nCGImageRef thumbnailImageRef = [_alAsset thumbnail];
\nif (thumbnailImageRef) {
\nresultImage = [UIImage imageWithCGImage:thumbnailImageRef];
\n}
\n}
\n_thumbnailImage = resultImage;
\nreturn resultImage;
\n}<\/p>\n

– (NSInteger)requestThumbnailImageWithSize:(CGSize)size completion:(void (^)(UIImage *, NSDictionary *))completion {
\nif (_usePhotoKit) {
\nif (_thumbnailImage) {
\nif (completion) {
\ncompletion(_thumbnailImage, nil);
\n}
\nreturn 0;
\n} else {
\nPHImageRequestOptions *imageRequestOptions = [[PHImageRequestOptions alloc] init];
\nimageRequestOptions.resizeMode = PHImageRequestOptionsResizeModeExact;
\n\/\/ \u5728 PHImageManager \u4e2d\uff0ctargetSize \u7b49 size \u90fd\u662f\u4f7f\u7528 px \u4f5c\u4e3a\u5355\u4f4d\uff0c\u56e0\u6b64\u9700\u8981\u5bf9targetSize \u4e2d\u5bf9\u4f20\u5165\u7684 Size \u8fdb\u884c\u5904\u7406\uff0c\u5bbd\u9ad8\u5404\u81ea\u4e58\u4ee5 ScreenScale\uff0c\u4ece\u800c\u5f97\u5230\u6b63\u786e\u7684\u56fe\u7247
\nreturn [[[QMUIAssetsManager sharedInstance] phCachingImageManager] requestImageForAsset:_phAsset targetSize:CGSizeMake(size.width * ScreenScale, size.height * ScreenScale) contentMode:PHImageContentModeAspectFill options:imageRequestOptions resultHandler:^(UIImage *result, NSDictionary *info) {
\n\/\/ \u6392\u9664\u53d6\u6d88\uff0c\u9519\u8bef\uff0c\u4f4e\u6e05\u56fe\u4e09\u79cd\u60c5\u51b5\uff0c\u5373\u5df2\u7ecf\u83b7\u53d6\u5230\u4e86\u9ad8\u6e05\u56fe\u65f6\uff0c\u628a\u8fd9\u5f20\u9ad8\u6e05\u56fe\u7f13\u5b58\u5230 _thumbnailImage \u4e2d
\nBOOL downloadFinined = ![[info objectForKey:PHImageCancelledKey] boolValue] && ![info objectForKey:PHImageErrorKey] && ![[info objectForKey:PHImageResultIsDegradedKey] boolValue];
\nif (downloadFinined) {
\n_thumbnailImage = result;
\n}
\nif (completion) {
\ncompletion(result, info);
\n}
\n}];
\n}
\n} else {
\nif (completion) {
\ncompletion([self thumbnailWithSize:size], nil);
\n}
\nreturn 0;
\n}
\n}<\/p><\/div>\n

<\/div>\n<\/div>\n

\u00a03. \u9884\u89c8\u56fe<\/h3>\n

\u4e0e\u4e0a\u9762\u7684\u65b9\u6cd5\u7c7b\u4f3c\uff0c\u4e0d\u518d\u5c55\u5f00\u8bf4\u660e\u3002<\/p>\n

.h \u6587\u4ef6<\/p>\n

\n
\/**
\n*\u00a0 Asset \u7684\u9884\u89c8\u56fe
\n*
\n*\u00a0 @warning \u4eff\u7167 ALAssetsLibrary \u7684\u505a\u6cd5\u8f93\u51fa\u4e0e\u5f53\u524d\u8bbe\u5907\u5c4f\u5e55\u5927\u5c0f\u76f8\u540c\u5c3a\u5bf8\u7684\u56fe\u7247\uff0c\u5982\u679c\u56fe\u7247\u539f\u56fe\u5c0f\u4e8e\u5f53\u524d\u8bbe\u5907\u5c4f\u5e55\u7684\u5c3a\u5bf8\uff0c\u5219\u53ea\u8f93\u51fa\u539f\u56fe\u5927\u5c0f\u7684\u56fe\u7247
\n*\u00a0 @return Asset \u7684\u5168\u5c4f\u56fe
\n*\/
\n– (UIImage *)previewImage;<\/p>\n

\/**
\n*\u00a0 \u5f02\u6b65\u8bf7\u6c42 Asset \u7684\u9884\u89c8\u56fe\uff0c\u53ef\u80fd\u4f1a\u6709\u7f51\u7edc\u8bf7\u6c42
\n*
\n*\u00a0 @param completion\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u5b8c\u6210\u8bf7\u6c42\u540e\u8c03\u7528\u7684 block\uff0c\u53c2\u6570\u4e2d\u5305\u542b\u4e86\u8bf7\u6c42\u7684\u9884\u89c8\u56fe\u4ee5\u53ca\u56fe\u7247\u4fe1\u606f\uff0c\u5728 iOS 8.0 \u6216\u4ee5\u4e0a\u7248\u672c\u4e2d\uff0c
\n*\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd9\u4e2a block \u4f1a\u88ab\u591a\u6b21\u8c03\u7528\uff0c\u5176\u4e2d\u7b2c\u4e00\u6b21\u8c03\u7528\u83b7\u53d6\u5230\u7684\u5c3a\u5bf8\u5f88\u5c0f\u7684\u4f4e\u6e05\u56fe\uff0c\u7136\u540e\u4e0d\u65ad\u8c03\u7528\uff0c\u76f4\u63a5\u83b7\u53d6\u5230\u9ad8\u6e05\u56fe\uff0c
\n*\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u83b7\u53d6\u5230\u9ad8\u6e05\u56fe\u540e QMUIAsset \u4f1a\u7f13\u5b58\u8d77\u8fd9\u5f20\u9ad8\u6e05\u56fe\uff0c\u8fd9\u65f6 block \u4e2d\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff08\u56fe\u7247\u4fe1\u606f\uff09\u8fd4\u56de\u7684\u4e3a nil\u3002
\n*\u00a0 @param phProgressHandler \u5904\u7406\u8bf7\u6c42\u8fdb\u5ea6\u7684 handler\uff0c\u4e0d\u5728\u4e3b\u7ebf\u7a0b\u4e0a\u6267\u884c\uff0c\u5728 block \u4e2d\u4fee\u6539 UI \u65f6\u6ce8\u610f\u9700\u8981\u624b\u5de5\u653e\u5230\u4e3b\u7ebf\u7a0b\u5904\u7406\u3002
\n*
\n*\u00a0 @wraning iOS 8.0 \u4ee5\u4e0b\u4e2d\u5e76\u6ca1\u6709\u5f02\u6b65\u8bf7\u6c42\u9884\u89c8\u56fe\u7684\u63a5\u53e3\uff0c\u56e0\u6b64\u5b9e\u9645\u4e0a\u4e3a\u540c\u6b65\u8bf7\u6c42\uff0c\u8fd9\u65f6 block \u4e2d\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff08\u56fe\u7247\u4fe1\u606f\uff09\u8fd4\u56de\u7684\u4e3a nil\u3002
\n*
\n*\u00a0 @return \u8fd4\u56de\u8bf7\u6c42\u56fe\u7247\u7684\u8bf7\u6c42 id
\n*\/
\n– (NSInteger)requestPreviewImageWithCompletion:(void (^)(UIImage *, NSDictionary *))completion withProgressHandler:(PHAssetImageProgressHandler)phProgressHandler;<\/p><\/div>\n

<\/div>\n<\/div>\n

.m \u6587\u4ef6<\/p>\n

\n
– (UIImage *)previewImage {
\nif (_previewImage) {
\nreturn _previewImage;
\n}
\n__block UIImage *resultImage;
\nif (_usePhotoKit) {
\nPHImageRequestOptions *imageRequestOptions = [[PHImageRequestOptions alloc] init];
\nimageRequestOptions.synchronous = YES;
\n[[[QMUIAssetsManager sharedInstance] phCachingImageManager] requestImageForAsset:_phAsset
\ntargetSize:CGSizeMake(SCREEN_WIDTH, SCREEN_HEIGHT)
\ncontentMode:PHImageContentModeAspectFill
\noptions:imageRequestOptions
\nresultHandler:^(UIImage *result, NSDictionary *info) {
\nresultImage = result;
\n}];
\n} else {
\nCGImageRef fullScreenImageRef = [_alAssetRepresentation fullScreenImage];
\nresultImage = [UIImage imageWithCGImage:fullScreenImageRef];
\n}
\n_previewImage = resultImage;
\nreturn resultImage;
\n}<\/p>\n

– (NSInteger)requestPreviewImageWithCompletion:(void (^)(UIImage *, NSDictionary *))completion withProgressHandler:(PHAssetImageProgressHandler)phProgressHandler {
\nif (_usePhotoKit) {
\nif (_previewImage) {
\n\/\/ \u5982\u679c\u5df2\u7ecf\u6709\u7f13\u5b58\u7684\u56fe\u7247\u5219\u76f4\u63a5\u62ff\u7f13\u5b58\u7684\u56fe\u7247
\nif (completion) {
\ncompletion(_previewImage, nil);
\n}
\nreturn 0;
\n} else {
\nPHImageRequestOptions *imageRequestOptions = [[PHImageRequestOptions alloc] init];
\nimageRequestOptions.networkAccessAllowed = YES; \/\/ \u5141\u8bb8\u8bbf\u95ee\u7f51\u7edc
\nimageRequestOptions.progressHandler = phProgressHandler;
\nreturn [[[QMUIAssetsManager sharedInstance] phCachingImageManager] requestImageForAsset:_phAsset targetSize:CGSizeMake(SCREEN_WIDTH, SCREEN_HEIGHT) contentMode:PHImageContentModeAspectFill options:imageRequestOptions resultHandler:^(UIImage *result, NSDictionary *info) {
\n\/\/ \u6392\u9664\u53d6\u6d88\uff0c\u9519\u8bef\uff0c\u4f4e\u6e05\u56fe\u4e09\u79cd\u60c5\u51b5\uff0c\u5373\u5df2\u7ecf\u83b7\u53d6\u5230\u4e86\u9ad8\u6e05\u56fe\u65f6\uff0c\u628a\u8fd9\u5f20\u9ad8\u6e05\u56fe\u7f13\u5b58\u5230 _previewImage \u4e2d
\nBOOL downloadFinined = ![[info objectForKey:PHImageCancelledKey] boolValue] && ![info objectForKey:PHImageErrorKey] && ![[info objectForKey:PHImageResultIsDegradedKey] boolValue];
\nif (downloadFinined) {
\n_previewImage = result;
\n}
\nif (completion) {
\ncompletion(result, info);
\n}
\n}];
\n}
\n} else {
\nif (completion) {
\ncompletion([self previewImage], nil);
\n}
\nreturn 0;
\n}
\n}<\/p><\/div>\n<\/div>\n

\u00a04. \u65b9\u5411\uff08imageOrientation\uff09<\/h3>\n

\u6bd4\u8f83\u5947\u602a\u7684\u662f\uff0c\u65e0\u8bba\u5728 PhotoKit \u6216\u8005\u662f ALAssetLibrary \u4e2d\uff0c\u8981\u60f3\u83b7\u53d6\u5230\u51c6\u786e\u7684\u56fe\u50cf\u65b9\u5411\uff0c\u53ea\u80fd\u901a\u8fc7\u67d0\u4e9b key \u68c0\u7d22\u6240\u5f97\u3002<\/p>\n

.h \u6587\u4ef6<\/p>\n

\n
– (UIImageOrientation)imageOrientation;<\/div>\n<\/div>\n

.m \u6587\u4ef6<\/p>\n

- (UIImageOrientation)imageOrientation {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>UIImageOrientation orientation;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code> (_usePhotoKit) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code> (!_phAssetInfo) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ PHAsset \u7684 UIImageOrientation \u9700\u8981\u8c03\u7528\u8fc7 requestImageDataForAsset \u624d\u80fd\u83b7\u53d6<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>[<\/code>self<\/code> requestPhAssetInfo];<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ \u4ece PhAssetInfo \u4e2d\u83b7\u53d6 UIImageOrientation \u5bf9\u5e94\u7684\u5b57\u6bb5<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>orientation = (UIImageOrientation)[_phAssetInfo[<\/code>@\"orientation\"<\/code>] integerValue];<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>} <\/code>else<\/code> {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>orientation = (UIImageOrientation)[[_alAsset valueForProperty:<\/code>@\"ALAssetPropertyOrientation\"<\/code>] integerValue];<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code> orientation;<\/code><\/div>\n
}<\/code><\/div>\n

\u7cfb\u5217\u6587\u7ae0\uff1a<\/p>\n","protected":false},"excerpt":{"rendered":"

\u4e09. \u5e38\u7528\u65b9\u6cd5\u7684\u5c01\u88c5 \u867d\u7136 PhotoKit \u7684\u529f\u80fd\u5f3a\u5927\u5f88\u591a\uff0c\u4f46\u57fa\u4e8e\u517c\u5bb9 iOS 8.0 \u4ee5\u4e0b\u7248\u672c\u7684\u8003\u8651\uff0c\u6682\u65f6 …<\/span> Read More →<\/span><\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29],"tags":[30],"class_list":["post-185","post","type-post","status-publish","format-standard","hentry","category-ios","tag-ios"],"_links":{"self":[{"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/posts\/185","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=185"}],"version-history":[{"count":1,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/posts\/185\/revisions"}],"predecessor-version":[{"id":186,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/posts\/185\/revisions\/186"}],"wp:attachment":[{"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=185"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=185"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=185"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}