Using UIGestureRecognizer

最新推荐文章于 2018-10-11 15:10:10 发布

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最新推荐文章于 2018-10-11 15:10:10 发布

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原文链接：http://www.cnblogs.com/playerc/archive/2013/04/02/using_uigesturerecogniz

本文介绍如何利用UIPanGestureRecognizer实现iOS应用中视图的拖动功能，包括初始化手势识别器、处理触摸事件及更新视图位置。

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.   

    [MoveMe.titleLabel setText:NSLocalizedString(@"Move Me Now!",@"")];

　　// Init 
    UIPanGestureRecognizer * mPanGR = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(onMoveMePan:)];
 　// add To MoveMe
    [MoveMe addGestureRecognizer:mPanGR];
}

- (void) onMoveMePan:(UIPanGestureRecognizer *)gestureRecognizer {
    UIView * v = [gestureRecognizer view];


    if (v == MoveMe ) { 
　　　　//Get Locations Before Modify Any Thing ,!!! It'w may reset locations while you change other options,such like Text       
        CGPoint translation = [gestureRecognizer translationInView:[v superview]];
        CGPoint center= MoveMe.center;
if ([gestureRecognizer state] == UIGestureRecognizerStateBegan || [gestureRecognizer state] == UIGestureRecognizerStateChanged) {            

            [MoveMe.titleLabel setText:NSLocalizedString(@"Moving!",@"")];
            
            //Move !!! must be happen after alter other options;
            translation.x += center.x;
            translation.y += center.y;
            v.center = translation;
            
        }
        if ([gestureRecognizer state] == UIGestureRecognizerStateEnded) {            
            MoveMe.titleLabel.text = NSLocalizedString(@"Move End",@"");
            
　　　　　　　　//Move
            translation.x += center.x;
            translation.y += center.y;
            v.center = translation;
        }
　　　　　　// reset the Offect Vector to zero offter handled
        [gestureRecognizer setTranslation:CGPointZero inView:v.superview];
    }

}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)dealloc {    
    [MoveMe release];
    [super dealloc];
}