iOS接觸UIImageView

Question

  - (void)viewDidLoad
 {
  [super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
   container = [[UIView alloc] initWithFrame:self.view.frame];
UIImageView* main_im0 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"icon1.png"]];
[container addSubview:main_im0];
[self.view addSubview:container];

 }

 -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *tt = [touches anyObject];

UIImageView *touchedview=(UIImageView*)[tt view];


NSArray *views = [container subviews];



 for (UIImageView* im in views)
 {
    UIImageView* focus=im;
    if (touchedview==focus)
    {

    }

}

}

我有一段代碼來設置一個名為main_im0的ImageView，將其放入UIView容器中，然后將其放入視圖中。 當我按一下main_im0時，我期望觸摸功能會達到touchedview == focus的條件。 但是，我無法激活該條件？ 怎么了？

Answer 1

請啟用

main_im0.userInteractionEnabled = YES;

默認情況下， UIImageView為No

Answer 2

傑森（Jason），也許我在誤解您的代碼，但是您是否不打算在UIView上實現點擊手勢呢？

您可以使用：

// enable user interaction with this view
main_img0.userInteractionEnabled = YES;

// setup a tap gesture to call a method once triggered (like a javascript mouseClick event)
UITapGesture *tapGesture = [[UITapGesture alloc] initWithTarget:self selector:@selector(myMethodToDoSomething)];

[main_img0 addGestureRecognizer:tapGesture];

// if you are not using Automatic Reference Counting, then remember to release your allocated tapGesture object
[tapGesture release];


...somewhere later in your code....


// method to do something
-(void)myMethodToDoSomething
{
    NSLog(@"This method executed");
}

現在，當您點擊main_img0視圖時，將執行方法“ myMethodToDoSomething”

順便說一句，如果您只想使用自己的Photoshop設計的圖像來創建自定義外觀的按鈕，則只需使用代碼創建UIButton並設置UIButton的背景圖像屬性即可。 像這樣：

UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 50)];
[button setImage:[UIImage imageNamed:@"mybutton.png"] forControlState:UIControlStateNormal];