IOS手势处理
IOS手势处理
介绍
IOS中触控事件一般是多点触控事件，加速计事件（翻译不太好），远程控制事件。在IOS中大量的手势识别苹果都已经给我们处理好了他们都在UIKit中，例如UIControl的子类UIButton，UISlider已经做好了手势的识别。触碰button能够触发事件，滑动slider触发事件。在IOS中的大部分控件都已经为我们做好了手势的识别，但是如果我们想要自己DIY一个控件有需要手势判断怎么办呢?好接下来进入正题开始Gesture Recognizers之旅。
Gesture recognizers 能够正确的判断出用户的手势如pinch（捏）、swipe（滑动）、旋转等。Gesture recognizers能够将底层的事件处理代码转换到高层次的
动作中。
示例代码：
#import "PMBViewController.h"
@interface PMBViewController ()<UIGestureRecognizerDelegate>{
int count;
}
@property (weak, nonatomic) IBOutlet UILabel *label;
@end
@implementation PMBViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self.view addGestureRecognizer:[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture)]];
count = 0;
}
- (void)handleGesture{
count ++;
self.label.text = [NSString stringWithFormat:@"%d",count];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
以下是Gesture recognizer 识别的手势
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self.view addGestureRecognizer:[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanGesture:)]];
}
- (void)handlePanGesture:(UIGestureRecognizer *)sender{
CGPoint point = [sender locationInView:self.view];
NSLog(@"X:%f Y:%f",point.x,point.y);
}
Table 1-1 Gesture recognizer classes of the UIKit framework
Gesture
UIKit class
Tapping (any number of taps)
UITapGestureRecognizer
Pinching in and out (for zooming a view)
UIPinchGestureRecognizer
Panning or dragging
UIPanGestureRecognizer
Swiping (in any direction)
UISwipeGestureRecognizer
Rotating (fingers moving in opposite directions)
UIRotationGestureRecognizer
Long press (also known as “touch and hold”)
UILongPressGestureRecognizer
由以上示例代码可知Gesture Recognizer需要依附于一个view，但view确可以有多个Gesture Recognizer，因为一个view可能需要相应多个不同的手势。