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];
}];
}
self.requestOptions是.h中的一个属性
@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.
