Я написал простой метод для извлечения данных из библиотеки ресурсов, который отлично работает на iOS4.3, но с задержкой при загрузке изображений в iOS5. Что я должен сделать, чтобы ускорить процесс извлечения на iOS 5.
-(void)setImages
{
int count =0;
int photoNumber = [[templateDictionary objectForKey:@"ElementsOnPage"] intValue];
for (int i=currentCount; count<photoNumber; i++) {
[self data:count+1 count:i];
count++;
}
}
-(void)data:(int)photoNumber count:(int)currentCount
{
NSURL *url;
UIImageView *firstImageView = [[UIImageView alloc]init];
CGFloat x,y,wid,h;
float ang;
if (currentCount>=[ImageURLArray count]) {
[firstImageView release];
return;
}
else
{
url = [NSURL URLWithString:[ImageURLArray objectAtIndex:currentCount]];
switch (photoNumber) {
case 1:
{
x = [[templateDictionary objectForKey:@"FirstElement_X"]floatValue];
y=[[templateDictionary objectForKey:@"FirstElement_Y"]floatValue];
wid = [[templateDictionary objectForKey:@"FirstElement_Width"]floatValue];
h=[[templateDictionary objectForKey:@"FirstElement_Height"]floatValue];
ang =[[templateDictionary objectForKey:@"FirstElement_Angle"]floatValue];
firstImageView.tag = 1+10;
//FirstImage
}
break;
case 2:
{
x = [[templateDictionary objectForKey:@"SecondElement_X"]floatValue];
y=[[templateDictionary objectForKey:@"SecondElement_Y"]floatValue];
wid = [[templateDictionary objectForKey:@"SecondElement_Width"]floatValue];
h=[[templateDictionary objectForKey:@"SecondElement_Height"]floatValue];
ang =[[templateDictionary objectForKey:@"SecondElement_Angle"]floatValue];
firstImageView.tag=2+10;
//SecondImage
}
break;
case 3:
{
x = [[templateDictionary objectForKey:@"ThirdElement_X"]floatValue];
y=[[templateDictionary objectForKey:@"ThirdElement_Y"]floatValue];
wid = [[templateDictionary objectForKey:@"ThirdElement_Width"]floatValue];
h=[[templateDictionary objectForKey:@"ThirdElement_Height"]floatValue];
ang =[[templateDictionary objectForKey:@"ThirdElement_Angle"]floatValue];
firstImageView.tag = 3+10;
//ThirdImage
}
break;
default:
break;
}
[firstImageView setFrame:CGRectMake(x, y, wid, h)];
dispatch_async(dispatch_get_main_queue(), ^
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
// Enumerate just the photos and videos group by using ALAssetsGroupSavedPhotos.
[library assetForURL:url
resultBlock:^(ALAsset* asset)
{
UIImage* img = [UIImage imageWithCGImage:[asset.defaultRepresentation fullResolutionImage]];
[firstImageView setImage:img];
}
failureBlock:^(NSError* error)
{
NSLog(@"error requesting asset");
}
];
[library release];
// Group enumerator Block
[pool release];
});
if ([[contentType objectAtIndex:currentCount]isEqualToString:@"1"]) {
UIButton *videoImage = [[UIButton alloc]initWithFrame:CGRectMake((firstImageView.frame.size.width/2)-25,(firstImageView.frame.size.height/2)-25,50,50)];
videoImage.transform = CGAffineTransformMakeRotation(ang*(3.14/180));
[videoImage setBackgroundImage:[UIImage imageNamed:@"videothumb.png"] forState:UIControlStateNormal];
[videoImage addTarget:self action:@selector(PlayMusicOnClickofButton:) forControlEvents:UIControlEventTouchUpInside];
[firstImageView addSubview:videoImage];
videoImage.tag = currentCount+1000;
[videoImage release];
}
}
firstImageView.transform = CGAffineTransformMakeRotation(ang*(3.14/180));
firstImageView.userInteractionEnabled = YES;
[coverImageView addSubview:firstImageView];
[coverImageView setImage:[UIImage imageNamed:innerBackground]];
[firstImageView release];
}