在用戶觸摸位置放置圖像

Question

基本上，觸摸屏圖像應顯示在觸摸位置但不起作用。

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    UITouch *touch = [[event allTouches] anyObject]; 
    CGPoint location = [touch locationInView:touch.view]; 
    UIImage *image = [[UIImage alloc]initWithContentsOfFile:@"BluePin.png"]; 
    [image drawAtPoint:CGPointMake(location.x, location.y)]; 
} 

Answer 1

您在一個UIImage着電話，因爲它僅持有的圖像數據，你必須使用的UIImageView，而不是再是應該工作。

所以用這個來代替：

-(void) touchBegan:(NSSet *)touches withEvent:(UIEvent *)event { 
UITouch *touch = [[event allTouches] anyObject]; 
CGPoint location = [touch locationInView:touch.view]; 
UImageView *imageView = [[UIImageView alloc] init]; 
UIImage *image = [[UIImage imageNamed:@"BluePin.png"]; 
imageView.image = image; 
[imageView drawAtPoint:CGPointMake(location.x, location.y)]; 
} 

希望這有助於：d