Question

我想在TTImageView中显示一些TTScrollView。

- (UIView*)scrollView:(TTScrollView*)scrollView pageAtIndex:(NSInteger)pageIndex {

TTView* pageView = nil;
if (!pageView) {
    pageView = [[[TTView alloc] init] autorelease];
    pageView.backgroundColor = [UIColor clearColor];
    pageView.userInteractionEnabled = NO;
}

NSString *imagePath = [self.screenShotImgPath objectAtIndex:pageIndex];
TTImageView *imageView = [[[TTImageView alloc] initWithFrame:CGRectZero] autorelease];
imageView.autoresizesToImage = YES;
imageView.urlPath = imagePath;
imageView.backgroundColor = [UIColor clearColor];
imageView.delegate = self;


//here I need to rotate image
if (imageView.width > imageView.height){
    CGAffineTransform  tran = CGAffineTransformIdentity;
    CGSize             bnds = imageView.size;
    CGSize             bnds2 = imageView.size;
    bnds = [self swapWidthAndHeight:bnds];
    tran = CGAffineTransformMakeTranslation(0.0,bnds2.width);
    tran = CGAffineTransformRotate(tran, [self degreesToRadians:-90.0]);
    imageView.transform = tran;

}

//here I need to scale image view frame to fit image actual scale
CGFloat scale = imageView.width/imageView.height;
CGFloat scaledWidth = (scrollView.height - 20.f) * scale;
imageView.frame = CGRectMake((scrollView.width - scaledWidth)/2, 10.f, scaledWidth, scrollView.height - 20.f);
[pageView addSubview:imageView];
return pageView;
}

但是有一个问题：TTImageView异步下载图像。因此，当代码转到

时，可能会退出

 if (imageView.width > imageView.height){

此行未加载图像。因此抛出异常。

由于图像视图已添加到

中

- (UIView*)scrollView:(TTScrollView*)scrollView pageAtIndex:(NSInteger)pageIndex {

所以我无法将以下旋转代码移出此方法

  if (imageView.width > imageView.height){
    CGAffineTransform  tran = CGAffineTransformIdentity;
    CGSize             bnds = imageView.size;
    CGSize             bnds2 = imageView.size;
    bnds = [self swapWidthAndHeight:bnds];
    tran = CGAffineTransformMakeTranslation(0.0,bnds2.width);
    tran = CGAffineTransformRotate(tran, [self degreesToRadians:-90.0]);
    imageView.transform = tran;
   }

我能做些什么来解决这个问题？

Answer 1

您可以在.h文件中添加<TTImageViewDelegate> 这个函数在.m：

中

#pragma mark TTImageViewDelegate
-(void) imageView:(TTImageView *)imageView didLoadImage:(UIImage *)image{      
    if (image){
        //do your logic
    }
}

图像加载完成后将触发此功能。

TTImageView问题

1 个答案: