[英]iOS: Get last image from the camera roll
I want the last image saved in camera roll. 我想要最后一张保存在相机胶卷中的图像。 I have searched for it but m getting result for ALAssetsLibrary which is deprecated in iOS 9 so please provide me solution for this because m not getting proper solution for that.
我已经搜索了它,但是获得了iOS 9中不推荐使用的ALAssetsLibrary的结果,所以请为此提供解决方案,因为我没有得到适当的解决方案。
I want solution in objective C. 我想要目标C中的解决方案。
Please check this code... it may help you. 请检查此代码...可能会对您有所帮助。
PHFetchOptions *fetchOptions = [[PHFetchOptions alloc] init];
fetchOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES]];
PHFetchResult *fetchResult = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:fetchOptions];
PHAsset *lastAsset = [fetchResult lastObject];
[[PHImageManager defaultManager] requestImageForAsset:lastAsset
targetSize:self.photoLibraryButton.bounds.size
contentMode:PHImageContentModeAspectFill
options:PHImageRequestOptionsVersionCurrent
resultHandler:^(UIImage *result, NSDictionary *info) {
dispatch_async(dispatch_get_main_queue(), ^{
[[self photoLibraryButton] setImage:result forState:UIControlStateNormal];
});
}];
In iOS 8, Apple added the Photos library which makes for easier querying. 在iOS 8中,Apple添加了“照片”库,该库使查询更加轻松。
import UIKit
import Photos
struct LastPhotoRetriever {
func queryLastPhoto(resizeTo size: CGSize?, queryCallback: (UIImage? -> Void)) {
let fetchOptions = PHFetchOptions()
fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
// fetchOptions.fetchLimit = 1 // This is available in iOS 9.
if let fetchResult = PHAsset.fetchAssetsWithMediaType(PHAssetMediaType.Image, options: fetchOptions) {
if let asset = fetchResult.firstObject as? PHAsset {
let manager = PHImageManager.defaultManager()
// If you already know how you want to resize,
// great, otherwise, use full-size.
let targetSize = size == nil ? CGSize(width: asset.pixelWidth, height: asset.pixelHeight) : size!
// I arbitrarily chose AspectFit here. AspectFill is
// also available.
manager.requestImageForAsset(asset,
targetSize: targetSize,
contentMode: .AspectFit,
options: nil,
resultHandler: { image, info in
queryCallback(image)
})
}
}
}
}
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