IOS 7 缩放在 ScrollView 中不起作用

Question

我正在构建一个 ViewController 只是为了显示一张图片。我以编程方式将 ImageView 添加到 ScrollView 。我想允许用户放大和缩小。这是我的代码

@interface ImageViewerViewController ()<UIScrollViewDelegate>
@property (nonatomic, strong) UIImageView *ImageView;
@property (weak, nonatomic) IBOutlet UIScrollView *Scroll;

@end

@implementation ImageViewerViewController

-(UIView*) viewForZoomingInScrollView{
    return self.ImageView;
}

-(void) viewDidLoad{
    self.Scroll.minimumZoomScale = 0.2;
    self.Scroll.maximumZoomScale = 1.5;
    self.Scroll.delegate = self;
    NSLog(@"View did load");
    if(self.imageName)
        [self updateImage];
}

-(void)setImageName:(NSString *)imageName{
    NSLog(@"set Image");
    _imageName = imageName;
}

-(void)updateImage{
    self.ImageView =[[UIImageView alloc]init];
    self.ImageView.image = [UIImage imageNamed:self.imageName];
    [self.ImageView sizeToFit];
    self.Scroll.contentSize = self.imageName? self.ImageView.image.size: CGSizeZero;
    [self.Scroll addSubview:self.ImageView];
}

@end

如您所见，我已经将滚动的委托(delegate)设置为 self 并添加了协议(protocol) header 和所需的消息。

但是缩放功能不起作用。

你能帮帮我吗？感谢您付出的时间和努力。

问候，

Answer 1

这将在我创建它的演示时起作用。如果有任何其他事情让我知道。

-(void)viewDidLoad
{
  float minimumScale = [_floorPlanImageView frame].size.width /[_floorPlanScrollView frame].size.width;
  _floorPlanScrollView.maximumZoomScale = 5;  //Change as per you need
  _floorPlanScrollView.minimumZoomScale = minimumScale;  //Change as you need
  _floorPlanScrollView.zoomScale = minimumScale;
  _floorPlanScrollView.delegate =self;
  _floorPlanScrollView.clipsToBounds = YES;
}

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
   return _floorPlanImageView;
}