UIButton over UIImageView（通過UIScrollView）

Question

我想要顯示一個圖像（大於iPhone的屏幕），用戶可以滾動。 不是很困難，我已經完成了這段代碼：在我的.h文件中

@interface mappa1 : UIViewController <UIScrollViewDelegate> {
IBOutlet UIImageView *img;
IBOutlet UIScrollView *scroller;
 }

在我的.m文件中

UIImage *image = [UIImage imageNamed:@"prova.jpg"];
img = [[UIImageView alloc] initWithImage:image];
scroller.delegate = self;
scroller.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
scroller.contentSize = img.frame.size;
scroller.scrollEnabled = YES;
scroller.directionalLockEnabled = NO;
scroller.userInteractionEnabled = YES;
CGSize ivsize = img.frame.size;
CGSize ssize = scroller.frame.size;

float scalex = ssize.width / ivsize.width;
float scaley = ssize.height / ivsize.height;
scroller.maximumZoomScale = 1.0;
scroller.minimumZoomScale = fmin(1.0, fmax(scalex, scaley));
scroller.zoomScale = fmin(1.0, fmax(scalex, scaley));
[scroller addSubview:img];

和

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {

return img;

}

一切正常！

現在我想在UIImage上添加一個UIButton，而不是在UIView上，因為我希望如果用戶縮放或移動圖像，則uibutton會跟隨uiimage的移動/縮放。

所以我添加這個代碼：

UIButton *btn = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain];
btn.frame = CGRectMake(0, 0, 100, 25);
[btn setTitle:@"Play" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(buttonClick)  forControlEvents:UIControlEventTouchUpInside];
[img addSubview:btn];

但是UIButton是“不可點擊的”！ 當然，UIView和UIImageView的UserInteractionEnabled設置為YES！

謝謝！

編輯：如果我寫

[scroller addSubView:btn];

它可以工作但是，當然，如果用戶放大/縮小，UIButton總是大100x25。

Answer 1

解決了！ 我不知道為什么，但如果我在Interface Builder中檢查了UserInteractionEnabled （在UIImageView上），它就不起作用了。 如果我寫

img.UserInteractionEnabled = YES;

有用！

Answer 2

我試過這個，它對我有用.......

UIImageView * imageView = [[UIImageView alloc]init];
[imageView setImage:[UIImage imageNamed:@"image.jpeg"]];
[imageView setFrame:CGRectMake(10,10,300,300)];
[imageView setContentMode:UIViewContentModeScaleToFill];
[imageView setUserInteractionEnabled:TRUE];

UIButton * ButtonOnImageView = [[UIButton alloc]init];
[ButtonOnImageView setFrame:CGRectMake(135,120,60,30)];
 [ButtonOnImageView setImage:[UIImage imageNamed:@"image.jpeg"]  forState:UIControlStateHighlighted];
 [ButtonOnImageView setImage:[UIImage imageNamed:@"image2.jpeg"] forState:UIControlStateNormal];
 [    ButtonOnImageView addTarget:self action:@selector(OnClickOfTheButton) forControlEvents:UIControlEventTouchUpInside];

 [imageView addSubview:ButtonOnImageView];
 [self.view addSubview:imageView];

Answer 3

本准則可能對您有用

http://developer.apple.com/library/ios/#samplecode/Scrolling/Listings/MyViewController_m.html#//apple_ref/doc/uid/DTS40008023-MyViewController_m-DontLinkElementID_6