Ios PHImageManager';“s方法”;requestImageDataForAsset“;以迅捷的速度撞车
我正在使用PhimageManager的requestImageDataForAsset来计算相机卷中特定照片的内存大小。它在我的设备上运行良好,但一些用户在计算内存大小后(通过分析和崩溃报告发现)出现连续崩溃Ios PHImageManager';“s方法”;requestImageDataForAsset“;以迅捷的速度撞车,ios,swift,xcode6,phasset,Ios,Swift,Xcode6,Phasset,我正在使用PhimageManager的requestImageDataForAsset来计算相机卷中特定照片的内存大小。它在我的设备上运行良好,但一些用户在计算内存大小后(通过分析和崩溃报告发现)出现连续崩溃 请提供帮助。它正在哪个iOS版本上崩溃,在iOS 8.3中对我来说似乎运行良好,如果您使用相同的过程获取图像元数据或内存大小:- -------------------------------------------------------------- -- get the UIIm
请提供帮助。它正在哪个iOS版本上崩溃,在iOS 8.3中对我来说似乎运行良好,如果您使用相同的过程获取图像元数据或内存大小:-
--------------------------------------------------------------
-- get the UIImage instance from a PHAsset
--------------------------------------------------------------
- (UIImage*)grabImageFromAsset:(PHAsset *)asset
{
__block UIImage *returnImage;
PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
options.synchronous = YES;
[[PHImageManager defaultManager] requestImageForAsset:asset
targetSize:CGSizeMake(200, 200)
contentMode:PHImageContentModeAspectFill
options:options
resultHandler:
^(UIImage *result, NSDictionary *info) {
returnImage = result;
}];
return returnImage;
}
--------------------------------------------------------------
-- get the metadata of the image from a PHAsset
--------------------------------------------------------------
- (NSDictionary *)grabImageDataFromAsset:(PHAsset *)asset
{
__block NSMutableDictionary *imageAssetInfo = [NSMutableDictionary new];
PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
options.synchronous = YES;
[[PHImageManager defaultManager] requestImageDataForAsset:asset
options:options
resultHandler:
^(NSData *imageData, NSString *dataUTI, UIImageOrientation orientation, NSDictionary *info) {
if ([info[@"PHImageResultIsInCloudKey"] isEqual:@YES]) {
// in the cloud
NSLog(@"in the cloud (sync grabImageDataFromAsset)");
}
imageAssetInfo = [info mutableCopy];
if (imageData) {
imageAssetInfo[@"IMAGE_NSDATA"] = imageData;
}
}];
return imageAssetInfo;
}
我的照片套件操作如下链接:-和当用户使用iCloud照片库将其照片存储在iCloud中时,我遇到了类似的问题。我可以通过使调用异步来解决这个问题。看起来像这样
let options = PHImageRequestOptions()
options.synchronous = false
options.networkAccessAllowed = true
下面是整个函数
func getImageDataFromAsset(asset: PHAsset, completion: (data: NSData?) -> Void) {
let manager = PHImageManager.defaultManager()
let options = PHImageRequestOptions()
options.networkAccessAllowed = true
options.synchronous = false
manager.requestImageDataForAsset(asset, options: options) { (result, string, orientation, info) -> Void in
if let imageData = result {
completion(data: imageData)
} else {
completion(data: nil)
}
}
}
如果您想加载photos.app中的所有照片,但不想使用iCloud。你可以做: 该示例适用于集合视图
@interface GalleryViewModel ()
@property (strong, nonatomic) NSMutableArray<PHAsset *> *assets;
@property (strong, nonatomic) PHImageManager *imageManager;
@property (strong, nonatomic) PHImageRequestOptions *requestOptions;
@property (strong, nonatomic) NSMutableArray<UIImage *> *imagesList;
@end
@implementation GalleryViewModel
- (instancetype) initWithContext:(ITXAppContext *)context {
self = [super initWithContext:context];
if (self) {
_assets = [[NSMutableArray alloc] init];
_imageManager = [PHImageManager defaultManager];
_requestOptions = [[PHImageRequestOptions alloc] init];
_imagesList = [[NSMutableArray alloc] init];
}
return self;
}
#pragma mark - Public methods
// ==================================================================================
// Public methods
- (void) viewModelDidLoad {
[self obtainAllPhotos];
}
#pragma mark - Private methods
// ==================================================================================
// Private methods
- (void) obtainAllPhotos {
self.requestOptions.resizeMode = PHImageRequestOptionsResizeModeExact;
self.requestOptions.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
self.requestOptions.synchronous = YES;
self.requestOptions.networkAccessAllowed = NO;
PHFetchOptions *fetchOptions = [[PHFetchOptions alloc] init];
fetchOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]];
PHFetchResult<PHAsset *> *result = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:fetchOptions];
__weak GalleryViewModel *weakSelf = self;
[result enumerateObjectsUsingBlock:^(PHAsset * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
[weakSelf.assets addObject:obj];
if (idx >= ([result count] - 1)) {
[weakSelf.viewDelegate setupView];
}
}];
}
#pragma mark - Get data from object
// ==================================================================================
// Get data from object
- (NSInteger) sizeGallery {
if (self.assets) {
return [self.assets count];
}
return 0;
}
- (UIImage *) imagesFromList:(NSInteger) index {
__block UIImage *imageBlock;
[self.imageManager requestImageForAsset:[self.assets objectAtIndex:index] targetSize:CGSizeMake(200, 200) contentMode:PHImageContentModeAspectFit options:self.requestOptions resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
if (result) {
imageBlock = result;
}
}];
return imageBlock;
}
@end
@interface GalleryViewModel()
@属性(强、非原子)NSMutableArray*资产;
@属性(强,非原子)PHImageManager*imageManager;
@属性(强,非原子)PHImageRequestOptions*requestOptions;
@属性(强,非原子)NSMutableArray*imagesList;
@结束
@GalleryViewModel的实现
-(instancetype)initWithContext:(ITXAppContext*)上下文{
self=[super initWithContext:context];
如果(自我){
_assets=[[NSMutableArray alloc]init];
_imageManager=[PHImageManager defaultManager];
_requestOptions=[[PHImageRequestOptions alloc]init];
_imagesList=[[NSMutableArray alloc]init];
}
回归自我;
}
#pragma标记-公共方法
// ==================================================================================
//公共方法
-(无效)viewModelDidLoad{
[自备照片];
}
#pragma标记-私有方法
// ==================================================================================
//私有方法
-(无效)获取所有照片{
self.requestOptions.resizeMode=phimagerequestoptions resizemodeexact;
self.requestOptions.deliveryMode=PhimageRequestOptions DeliveryModeHighQualityFormat;
self.requestOptions.synchronous=是;
self.requestOptions.networkAccessAllowed=否;
PHFetchOptions*fetchOptions=[[PHFetchOptions alloc]init];
fetchOptions.sortDescriptors=@[[NSSortDescriptor SortDescriptor WithKey:@“creationDate”升序:否]];
PHFetchResult*result=[PHAsset FETCHASSETSWITMEDIATYPE:PHASSETMEDIATYPE图像选项:FETCHTOPTIONS];
__弱GalleryViewModel*weakSelf=self;
[结果enumerateObjectsUsingBlock:^(相集*\u非空对象,整数idx,布尔*\u非空停止){
[weakSelf.assets addObject:obj];
如果(idx>=([结果计数]-1)){
[weakSelf.viewDelegate setupView];
}
}];
}
#pragma标记-从对象获取数据
// ==================================================================================
//从对象获取数据
-(NSInteger)sizeGallery{
if(自我资产){
返回[自我资产盘点];
}
返回0;
}
-(UIImage*)图像列表:(NSInteger)索引{
__块UIImage*图像块;
[self.imageManager requestImageForAsset:[self.assets objectAtIndex:index]targetSize:CGSizeMake(200200)contentMode:PHImageContentModeAspectFit选项:self.requestOptions结果文件夹:^(UIImage*\u可为空的结果,NSDictionary*\u可为空的信息){
如果(结果){
imageBlock=结果;
}
}];
返回图像块;
}
@结束
OP正在使用Swift;这在这里可能会有所不同。我知道它在swift中,但在这个链接“”中,它们使用相同的脚本,并且它可以工作。@Vizllx该链接不存在Fixed link:(上一个链接不起作用,只是因为'symbol at end')@Vizllx感谢您的回复,对崩溃报告有什么想法吗?。所有iOS版本都是这样。