如何转换的UIImage在Objective-C [英] How to convert to UIImage in Objective-C
问题描述
我充满了 PHAsset
一个数组对象(<一个href=\"https://developer.apple.com/library/$p$prelease/ios/documentation/Photos/Reference/PHAsset_Class/index.html\" rel=\"nofollow\">https://developer.apple.com/library/$p$prelease/ios/documentation/Photos/Reference/PHAsset_Class/index.html),我想知道我怎么可以转换成一个UIImage,然后将它们保存在数组中。
I have an array filled with PHAsset
objects (https://developer.apple.com/library/prerelease/ios/documentation/Photos/Reference/PHAsset_Class/index.html), and I want to know how I can convert them into a UIImage and then save them in an Array.
与PHAsset对象的数组被称为 self.assets
这里是我迄今为止:
The array with the PHAsset objects is called self.assets
and here is what I have so far:
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是属性在.H
self.requestOptions is a property in the .h
@property (nonatomic, strong) PHImageRequestOptions *requestOptions;
和在viewDidLoad中我这样做:
and in the viewDidLoad I am doing this:
self.requestOptions = [[PHImageRequestOptions alloc] init];
self.requestOptions.resizeMode = PHImageRequestOptionsResizeModeExact;
self.requestOptions.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
但做一些调试完毕后,我不断看到, self.assets
具有以下值:
(
<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, assetSource=3, (2448x2448), creationDate=2015-07-27 02:02:47 +0000, location=1, hidden=0, favorite=0
)
和图片
是空的。有谁知道我如何添加转换成PHAssets和UIImages它们添加到图片
数组?任何帮助是AP preciated。谢谢!
and images
is empty. Does anyone know how I can add convert the PHAssets into UIImages and add them to the images
array? Any help is appreciated. Thanks!
推荐答案
有关,因为我对这个问题苦苦挣扎的人一样多,这是要走的路。
For anyone struggling as much as I had on this issue, this is the way to go.
首先设置requestOptions为:
First set the requestOptions as:
self.requestOptions = [[PHImageRequestOptions alloc] init];
self.requestOptions.resizeMode = PHImageRequestOptionsResizeModeExact;
self.requestOptions.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
// this one is key
self.requestOptions.synchronous = true;
和是否有在充满PHAsset对象的数组是多个资产,然后添加此code:
and if there are multiple assets in an array filled with PHAsset objects, then add this code:
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];
}];
}
现在图片
数组包含的UIImage
格式的所有图像。
and now the images
array contains all the images in uiimage
format.
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