关于IOS某图片添加控件，图片从相册或拍照保存后，再次进入时点击放大图无法显示的问题

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某图片添加控件：

https://github.com/XZTLLQ/LQPhotoPickerDemo

问题：

标题已说明

代码块：

NSArray *alAssetUrl =(NSMutableArray *)[HiddenRecordDataService getLocalImageSystemFilePath:_hiddenDangerInfoLocalModel.HiddenDangerInfoLocalId];
NSMutableArray *localASSetArray = [NSMutableArray arrayWithCapacity:];
for (NSURL *url in alAssetUrl) {
NSLog(@"url:%@", url);
ALAssetsLibrary* library = [[ALAssetsLibrary alloc]init];
// library fetch
[library assetForURL:url resultBlock:^(ALAsset *asset) {
if (asset) {
[localASSetArray addObject:asset];
} else {
// On iOS 8.1 [library assetForUrl] Photo Streams always returns nil. Try to obtain it in an alternative way
}
} failureBlock:^(NSError *error) {
iToast *itoast = [iToast makeText:@"获取图片失败"];
[itoast show];
}];
}

问题是由于标红代码导致，这里的ALAssetsLibrary对象需要用单例

代码如下：

NSArray *alAssetUrl =(NSMutableArray *)[HiddenRecordDataService getLocalImageSystemFilePath:_hiddenDangerInfoLocalModel.HiddenDangerInfoLocalId]; NSMutableArray *localASSetArray = [NSMutableArray arrayWithCapacity:]; for (NSURL *url in alAssetUrl) {
NSLog(@"url:%@", url);
//ALAssetsLibrary* library = [[ALAssetsLibrary alloc]init];
ALAssetsLibrary* library = [HiddenRecordViewController defaultAssetsLibrary];
// library fetch
[library assetForURL:url resultBlock:^(ALAsset *asset) {
if (asset) {
[localASSetArray addObject:asset];
} else {
// On iOS 8.1 [library assetForUrl] Photo Streams always returns nil. Try to obtain it in an alternative way
} } failureBlock:^(NSError *error) {
iToast *itoast = [iToast makeText:@"获取图片失败"];
[itoast show];
}]; }

defaultAssetsLibrary代码：

+ (ALAssetsLibrary *)defaultAssetsLibrary {
static dispatch_once_t pred = ;
static ALAssetsLibrary *library = nil;
dispatch_once(&pred, ^{
library = [[ALAssetsLibrary alloc] init];
});
return library;
}