我正在尝试让我的图片成为pan和zoomable，但是我似乎无法使其正常工作。
这是我的注释代码>创建UIScrollView>创建PFImageView（UIImage）>将图像添加到UIScrollView>提取并显示图像。
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
NSLog(@"%@",_courseObject); //checking object has loaded
UIScrollView *scrollView = [[UIScrollView alloc] init];
scrollView.frame = self.view.bounds; //scroll view occupies full parent view!
scrollView.contentSize = CGSizeMake(400, 800); //scroll view size
scrollView.showsVerticalScrollIndicator = YES; //to hide scroll indicators!
scrollView.showsHorizontalScrollIndicator = YES; //by default, it shows!
scrollView.scrollEnabled = YES; //say "NO" to disable scroll
[self.view addSubview:scrollView]; //adding to parent view!
PFImageView *mapImage = [[PFImageView alloc] init]; //create imageview
mapImage.frame = self.navigationController.view.frame; //set image boundaries to fill nav frame(!)
mapImage.image = [UIImage imageNamed:@"loading"]; //placeholder image
mapImage.file = (PFFile *)[_courseObject objectForKey:@"file"]; //retrieve the map image
[scrollView addSubview:mapImage]; //add the mapImage to scrollView
[mapImage loadInBackground]; //retrieve image and add
}
这里的问题是，scrollView.contentSize不够大，因此在尝试滚动时并不能吸收运动。
更改值以填充框架并实现委托协议，使我可以使用滚动视图。
UIScrollView *scrollView = [[UIScrollView alloc]initWithFrame:self.view.bounds];
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我来说两句