我有一个用于 uiimageView 的一键式手势识别器，使用户能够在此 uiimageview 上录制的任何位置点击并添加 uiTextField。
有时我将文本字段从 uiimageview 中取出（附近）的问题。我希望文本字段无论如何都不会超过 uiimageview 框架。
这是我在 ViewDidLoad 中的代码：
// Create gesture recognizer
recognizer =
[[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(addText:)] autorelease];
// Set required taps and number of touches
[recognizer setNumberOfTapsRequired:1];
[recognizer setNumberOfTouchesRequired:1];
// Add the gesture to the view
[self.img addGestureRecognizer:recognizer];
在方法 addText 中：
CGPoint point = [recognizer locationInView:[self view]];
UITextField * textFld = [[UITextField alloc]init];
[textFld setDelegate:self];
[textFld addTarget:self action:@selector(imageMoved:withEvent:) forControlEvents:UIControlEventTouchDragInside];
[textFld setFont:[UIFont fontWithName:@"System Bold" size:fontSize]];
CGRect frame ;
frame.origin.x = point.x;
frame.origin.y = point.y;
frame.size.width=300;
frame.size.height=80;
textFld.frame=frame;
[self.img addSubview:textFld];
[textFld release];
最后是 imageMoved:withEvent:
- (IBAction) imageMoved:(id)sender withEvent:(UIEvent *) event
{
CGPoint point = [[[event allTouches] anyObject] locationInView:self.view];
UIControl *control = sender;
control.center = point;
}