我有一个填充有PHAsset对象的数组(
https://developer.apple.com/library/prerelease/ios/documentation/Photos/Reference/PHAsset_Class/index.html),我想知道如何将它们转换成UIImage,然后将它们保存在数组中.
具有PHAsset对象的数组称为self.assets,这里是我现在所拥有的:
PHImageManager *manager = [PHImageManager defaultManager]; CGFloat scale = UIScreen.mainScreen.scale; NSMutableArray *images = [NSMutableArray arrayWithCapacity:[self.assets count]]; for (int i = 0; i < [self.assets count]; i++) { CGSize targetSize = CGSizeMake(scale,scale); [manager requestimageForAsset:[self.assets objectAtIndex:i] targetSize:targetSize contentMode:PHImageContentModeAspectFill options:self.requestOptions resultHandler:^(UIImage *image,NSDictionary *info){ [images addobject:image]; }]; }
@property (nonatomic,strong) PHImageRequestOptions *requestOptions;
在viewDidLoad中我正在做这个:
self.requestOptions = [[PHImageRequestOptions alloc] init]; self.requestOptions.resizeMode = PHImageRequestOptionsResizeModeExact; self.requestOptions.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
但是在做了一些调试之后,我看到self.assets有以下值:
( <PHAsset: 0x1743828a0> 3B6D658D-EC76-43A1-9793-35D889E9CF15/L0/001 mediaType=1/0,assetSource=3,(2448x2448),creationDate=2015-07-27 02:02:46 +0000,location=1,hidden=0,favorite=0,<PHAsset: 0x174382970> 50F05575-71D2-446B-BD1E-8E3250E375AD/L0/001 mediaType=1/0,creationDate=2015-07-27 02:02:47 +0000,favorite=0 )
解决方法
对于那个在这个问题上努力的人来说,这是要走的路.
首先将requestOptions设置为:
self.requestOptions = [[PHImageRequestOptions alloc] init]; self.requestOptions.resizeMode = PHImageRequestOptionsResizeModeExact; self.requestOptions.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat; // this one is key self.requestOptions.synchronous = true;
并且如果数组中有多个资源填充有PHAsset对象,则添加以下代码:
self.assets = [NSMutableArray arrayWithArray:assets]; PHImageManager *manager = [PHImageManager defaultManager]; NSMutableArray *images = [NSMutableArray arrayWithCapacity:[assets count]]; // assets contains PHAsset objects. __block UIImage *ima; for (PHAsset *asset in self.assets) { // Do something with the asset [manager requestimageForAsset:asset targetSize:PHImageManagerMaximumSize contentMode:PHImageContentModeDefault options:self.requestOptions resultHandler:^void(UIImage *image,NSDictionary *info) { ima = image; [images addobject:ima]; }]; }
现在图像阵列包含uiimage格式的所有图像.
原文地址:https://www.jb51.cc/iOS/329618.html
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