获取所有的cameraroll asynchrously图片 [英] Get All Images from cameraroll asynchrously
本文介绍了获取所有的cameraroll asynchrously图片的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想从cameraroll所有图像asynchrously
现在，我使用的code，但我的申请得到了绞刑，直到所有的图像检索，我在instigram或其他应用程序发现它doen't需要时间来从camerroll加载图片。
- （无效）getAllPictures
{ 的NSLog（@我米）; imageArray = [[NSArray的页头]初始化];
mutableArray = [[NSMutableArray里的alloc]初始化];
NSMutableArray里* assetURLDictionaries = [[NSMutableArray里的alloc]初始化];
库= [[ALAssetsLibrary的alloc]初始化];
无效（^ assetEnumerator）（ALAsset *，NSUInteger，BOOL *）= ^（ALAsset *结果，NSUInteger指数，BOOL *停止）{ 的NSLog（@我块M）;
如果（结果！=无）{
如果（[结果valueForProperty：ALAssetPropertyType] isEqualToString：ALAssetTypePhoto]）{
的NSLog（@结果不nill）;
[assetURLDictionaries ADDOBJECT：[导致valueForProperty：ALAssetPropertyURLs]]; NSURL * URL =（NSURL *）[导致defaultRe presentation] URL];
的NSLog（@URL =％@，URL）;
[库assetForURL：网址
resultBlock：^（ALAsset *资产）{
[mutableArray ADDOBJECT：[UIImage的imageWithCGImage：[[资产defaultRe presentation] fullScreenImage]]]; imageArray = [[NSArray的页头] initWithArray：mutableArray];
[个体经营allPhotosCollected：imageArray];
如果（[mutableArray计数] ==计数）
{的NSLog（@状态％禄％I（无符号长）mutableArray.count，计数）;
imageArray = [[NSArray的页头] initWithArray：mutableArray];
[个体经营allPhotosCollected：imageArray];
}
}
failureBlock：^（NSError *错误）{的NSLog（@操作没有全成！）; }]; }
}
};
的NSLog（@图像阵列=％@，imageArray）; NSMutableArray里* assetGroups = [[NSMutableArray里的alloc]初始化]; 无效（^ assetGroupEnumerator）（ALAssetsGroup *，* BOOL）= ^（ALAssetsGroup *组，BOOL *停止）{
如果（组！=无）{
的NSLog（@组不nill）;
[组enumerateAssetsUsingBlock：assetEnumerator];
[assetGroups ADDOBJECT：组];
数=（INT）组numberOfAssets]
}
}; assetGroups = [[NSMutableArray里的alloc]初始化]; [库enumerateGroupsWithTypes：ALAssetsGroupAll
usingBlock：assetGroupEnumerator
failureBlock：^（NSError *错误）{的NSLog（@这是一个错误）;}];
} - （无效）allPhotosCollected：（NSArray的*）imgArray
{
//从库中获得所有的照片后写在这里您code ...
的NSLog（@的所有图片都是％@，imgArray）;
[_collection_view reloadData]; / *
的CGRect collectionFrame = self.collection_view.frame; collectionFrame.size.height = 700;
collectionFrame.size.width = 320; * /self.verticalLayoutConstraint.constant = 700;
//self.collection_view.frame=collectionFrame;
}
解决方案
尝试这样的。它的增长速度快。如果你将获得阵列中的所有图像，然后它会在使用iPhone和放大器崩溃您的应用程序; iPad的包含1000多张照片。因此，尝试这样的。
库= [[ALAssetsLibrary的alloc]初始化];如果（库==无）
库= [[ALAssetsLibrary的alloc]初始化];[库enumerateGroupsWithTypes：ALAssetsGroupAll usingBlock：^（ALAssetsGroup *组，BOOL *停止）
{ [组enumerateAssetsUsingBlock：^（ALAsset *资产，NSUInteger指数，BOOL *停止）
{
如果（资产）
{
[imageArray ADDOBJECT：资产];
[collectionViewObj reloadData];
}
}];
}
failureBlock：^（NSError *误差）
{
UIAlertView中* alertViewObj = [[UIAlertView中页头] initWithTitle：@Max6Miz无法访问您的照片消息：@你可以在设置中启用获得委托：自我cancelButtonTitle：无otherButtonTitles：@设置，@确定 ，零]
[alertViewObj秀]
的NSLog（@错误）;
}];
使用显示在你这样的委托函数图像此的CollectionView cellForItemAtIndexPath
ALAsset *资产=（ALAsset *）imageArray [indexPath.row]
*的UIImage = showingImage [UIImage的imageWithCGImage：资产缩略图]];
I want to get all images from cameraroll asynchrously Now I am using that code but my application got hanged untill all the images retrieved , I noticed in instigram or other application it doen't take time to load picture from camerroll.
-(void)getAllPictures
{
NSLog(@"i m in ");
imageArray=[[NSArray alloc] init];
mutableArray =[[NSMutableArray alloc]init];
NSMutableArray* assetURLDictionaries = [[NSMutableArray alloc] init];
library = [[ALAssetsLibrary alloc] init];
void (^assetEnumerator)( ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *result, NSUInteger index, BOOL *stop) {
NSLog(@"i m in block");
if(result != nil) {
if([[result valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypePhoto]) {
NSLog(@"result not nill");
[assetURLDictionaries addObject:[result valueForProperty:ALAssetPropertyURLs]];
NSURL *url= (NSURL*) [[result defaultRepresentation]url];
NSLog(@"url=%@",url);
[library assetForURL:url
resultBlock:^(ALAsset *asset) {
[mutableArray addObject:[UIImage imageWithCGImage:[[asset defaultRepresentation] fullScreenImage]]];
imageArray=[[NSArray alloc] initWithArray:mutableArray];
[self allPhotosCollected:imageArray];
if ([mutableArray count]==count)
{NSLog(@"condition %lu , %i",(unsigned long)mutableArray.count,count);
imageArray=[[NSArray alloc] initWithArray:mutableArray];
[self allPhotosCollected:imageArray];
}
}
failureBlock:^(NSError *error){ NSLog(@"operation was not successfull!"); } ];
}
}
};
NSLog(@"image array= %@",imageArray);
NSMutableArray *assetGroups = [[NSMutableArray alloc] init];
void (^ assetGroupEnumerator) ( ALAssetsGroup *, BOOL *)= ^(ALAssetsGroup *group, BOOL *stop) {
if(group != nil) {
NSLog(@"group not nill");
[group enumerateAssetsUsingBlock:assetEnumerator];
[assetGroups addObject:group];
count=(int)[group numberOfAssets];
}
};
assetGroups = [[NSMutableArray alloc] init];
[library enumerateGroupsWithTypes:ALAssetsGroupAll
usingBlock:assetGroupEnumerator
failureBlock:^(NSError *error) {NSLog(@"There is an error");}];
}
-(void)allPhotosCollected:(NSArray*)imgArray
{
//write your code here after getting all the photos from library...
NSLog(@"all pictures are %@",imgArray);
[_collection_view reloadData];
/*
CGRect collectionFrame = self.collection_view.frame;
collectionFrame.size.height=700;
collectionFrame.size.width=320;*/
self.verticalLayoutConstraint.constant = 700;
//self.collection_view.frame=collectionFrame;
}
解决方案
Try like this .. Its increasing fast speed. If you will get all images in array then it will crashing your application while using iPhone & iPad that contain 1000+ photos. So Try like this.
library = [[ALAssetsLibrary alloc] init];
if (library == nil)
library = [[ALAssetsLibrary alloc] init];
[library enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop)
{
[group enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop)
{
if (asset)
{
[imageArray addObject:asset];
[collectionViewObj reloadData];
}
}];
}
failureBlock:^(NSError *error)
{
UIAlertView *alertViewObj = [[UIAlertView alloc]initWithTitle:@"Max6Miz does not have access to your photos" message:@"You can enable access in Settings" delegate:self cancelButtonTitle:nil otherButtonTitles:@"Settings",@"Ok", nil];
[alertViewObj show];
NSLog(@"error");
}];
Show your image in your delegate function like this using this collectionView cellForItemAtIndexPath
ALAsset *asset = (ALAsset *)imageArray[indexPath.row];
UIImage *showingImage = [UIImage imageWithCGImage:[asset thumbnail]];
这篇关于获取所有的cameraroll asynchrously图片的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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