拖拽(pan)手势

//
//  ViewController.m
//  拖拽手势
//
//  Created by Rio.King on 13-11-2.
//  Copyright (c) 2013年 Rio.King. All rights reserved.
//

#import "ViewController.h"

@inte易做图ce ViewController ()
@property (nonatomic, strong)UIPanGestureRecognizer *panGestureRecognizer;
@property (nonatomic, strong)UILabel *helloWorldLabel;
@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
	
    /*create a label*/
    CGRect labelFrame = CGRectMake(0.0f, 0.0f, 150.0f, 100.0f);
    self.helloWorldLabel = [[UILabel alloc] initWithFrame:labelFrame];
    self.helloWorldLabel.text = @"Hello World";
    self.helloWorldLabel.backgroundColor = [UIColor blackColor];
    self.helloWorldLabel.textColor = [UIColor whiteColor];
    self.helloWorldLabel.textAlignment = UITextAlignmentCenter;
    /*make sure to enable user interaction;other,tap events won't be caught on this label*/
    self.helloWorldLabel.userInteractionEnabled = YES;
    [self.view addSubview:self.helloWorldLabel];
    
    /*create the Pan Gesture Recognizer*/
    self.panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanGestures:)];
    self.panGestureRecognizer.minimumNumberOfTouches = 1;
    self.panGestureRecognizer.maximumNumberOfTouches = 1;
    [self.helloWorldLabel addGestureRecognizer:self.panGestureRecognizer];
}

-(void)handlePanGestures:(UIPanGestureRecognizer *)paramSender{
    if (paramSender.state != UIGestureRecognizerStateEnded && paramSender.state != UIGestureRecognizerStateFailed) {
        CGPoint location = [paramSender locationInView:paramSender.view.superview];
        paramSender.view.center = location;
    }
}

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

@end

补充：移动开发 , IOS ,

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