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ViewController.m
#import "ViewController.h"
@interface 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 = NSTextAlignmentCenter;
/*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;
}
}
@end
