网络加载图片

2019-04-15 19:17发布

站内文章 / PIC单片机
12950 0 1622
NSURL *imgUrl = [NSURL URLWithString:[NSString stringWithFormat:@"%@/%@",serverUrl,pic]]; //从服务器拿到图片的地址 // NSLog(@"fsdf %@",imgUrl); if (hasCachedImage(imgUrl)) { imghead.image = [UIImage imageWithContentsOfFile:pathForURL(imgUrl)]; //看本地理由木有这张图片的缓存 }else { NSDictionary *dic=[NSDictionary dictionaryWithObjectsAndKeys:imgUrl,@"url",imghead,@"imageView",nil]; [NSThread detachNewThreadSelector:@selector(cacheImage:) toTarget:[ImageCacher defaultCacher] withObject:dic]; } 
-(void)cacheImage:(NSDictionary*)aDic
{
    NSURL *aURL=[aDic objectForKey:@"url"];
    
    NSFileManager *fileManager=[NSFileManager defaultManager];
    NSData *data=[NSData dataWithContentsOfURL:aURL] ;
    UIImage *image=[UIImage imageWithData:data];
    if (image==nil) {
        return;
    }

    NSData *smallData=UIImagePNGRepresentation(image);
    
    
   
    
    NSLog(@"%@",pathInCacheDirectory(@"com.xmly"));
    NSString *pathStr = [NSString stringWithFormat:@"%@",pathInCacheDirectory(@"com.xmly")];
    if (![fileManager fileExistsAtPath:pathStr]) {
        
        [fileManager createDirectoryAtPath:pathStr withIntermediateDirectories:YES attributes:Nil error:Nil];
    }
    
    
    if (smallData) {
        [fileManager createFileAtPath:pathForURL(aURL) contents:smallData attributes:nil];
    }
    
    UIButton *bt = [aDic objectForKey:@"uibtton"];
    if (bt) {
        CATransition *transtion = [CATransition animation];
        transtion.duration = 0.5;
        [transtion setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
        [transtion setType:_type];
        [transtion setSubtype:kCATransitionFromRight];
        
        [bt.layer addAnimation:transtion forKey:@"transtionKey"];
            [bt setImage:image forState:UIControlStateNormal];
         UIGraphicsEndImageContext();
        
       
        return;
    }
    
    UIView *view=[aDic objectForKey:@"imageView"];
    
    
    
    //判断view是否还存在 如果tablecell已经移出屏幕会被回收 那么什么都不用做，下次滚到该cell 缓存已存在 不需要执行此方法
    if (view!=nil) {
        CATransition *transtion = [CATransition animation];
        transtion.duration = 0.5;
        [transtion setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
        [transtion setType:_type];
        [transtion setSubtype:kCATransitionFromRight];
        
        [view.layer addAnimation:transtion forKey:@"transtionKey"];
        
        if ([[view class] isSubclassOfClass:[UIImageView class]]) {
            if ([[aDic objectForKey:@"type"] boolValue]) {
                view.backgroundColor = [UIColor clearColor];
                
                [(UIImageView*)view setImage:[image grayscale:1]];
            }
            else
            {
                view.backgroundColor = [UIColor clearColor];
                
                [(UIImageView*)view setImage:image];
            }
        }
       
        else
        {
            if ([aDic objectForKey:@"mohu1"] && [[aDic objectForKey:@"mohu1"] length] > 0) {
                view.layer.contents = (id)[image blurredImage:70].CGImage;
                view.contentMode = UIViewContentModeScaleToFill;
            }
            else if ([aDic objectForKey:@"mohu"] && [[aDic objectForKey:@"mohu"] length] > 0) {
                view.layer.contents = (id)[image blurredImage:70].CGImage;
                view.contentMode = UIViewContentModeScaleAspectFill;
            }
            
            else if ([aDic objectForKey:@"fill"] && [[aDic objectForKey:@"fill"] length] > 0) {
                view.layer.contents = (id)image.CGImage;
                view.contentMode = UIViewContentModeScaleAspectFill;
            }
            else
            {
                if ([[aDic objectForKey:@"type"] boolValue]) {
                    view.backgroundColor = [UIColor colorWithPatternImage:[image grayscale:1]];
                }
                else
                {
                    view.backgroundColor = [UIColor colorWithPatternImage:image];
                }
            }
            
        }
        
    }
    UIGraphicsEndImageContext();
    
}