手势的3个混淆属性
2016-07-08 16:22
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本节介绍tap的3个弄不太林清并且容易混淆的属性:
cancelsTouchesInView/delaysTouchesBegan/delaysTouchesEnded
(0)首先要知道的是
(1)在默认情况下(即这3个属性都处于默认值的情况下),如果触摸window,首先由window上最先符合条件的控件(该控件记为hit-test view)接收到该touch并触发触摸事件touchesBegan。同时如果某个控件的手势识别器接收到了该touch,就会进行识别。手势识别成功之后发送触摸事件touchesCancelled给hit-testview,hit-test view不再响应touch。
(2)cancelsTouchesInView:
默认为YES,这种情况下当手势识别器识别到touch之后,会发送touchesCancelled给hit-testview以取消hit-test view对touch的响应,这个时候只有手势识别器响应touch。
当设置成NO时,手势识别器识别到touch之后不会发送touchesCancelled给hit-test,这个时候手势识别器和hit-test view均响应touch。
(3)delaysTouchesBegan:
默认是NO,这种情况下当发生一个touch时,手势识别器先捕捉到到touch,然后发给hit-testview,两者各自做出响应。如果设置为YES,手势识别器在识别的过程中(注意是识别过程),不会将touch发给hit-test view,即hit-testview不会有任何触摸事件。只有在识别失败之后才会将touch发给hit-testview,这种情况下hit-test view的响应会延迟约0.15ms。
(4)delaysTouchesEnded:
默认为YES。这种情况下发生一个touch时,在手势识别成功后,发送给touchesCancelled消息给hit-testview,手势识别失败时,会延迟大概0.15ms,期间没有接收到别的touch才会发送touchesEnded。如果设置为NO,则不会延迟,即会立即发送touchesEnded以结束当前触摸。
*/
演示代码如下,读者自行拷贝尝试
MyViw继承自UIView:
- (void)touchesBegan:(NSSet )touches withEvent:(UIEvent )event{
NSLog(@”__begin”);
}
- (void)touchesCancelled:(NSSet )touches withEvent:(UIEvent )event{
NSLog(@”__cancel”);
}
- (void)touchesEnded:(NSSet )touches withEvent:(UIEvent )event{
NSLog(@”__end”);
}
- (void)touchesMoved:(NSSet )touches withEvent:(UIEvent )event{
NSLog(@”__touch”);
}
@end
@property (nonatomic, strong) MyView *myView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
_myView = [[MyView alloc]initWithFrame:CGRectMake(50, 50, [UIScreen mainScreen].bounds.size.width - 100, 200)];
_myView.backgroundColor = [UIColor yellowColor];
[self.view addSubview:_myView];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapAction:)];
tap.numberOfTapsRequired = 2;
[_myView addGestureRecognizer:tap];
}
- (void)tapAction:(UITapGestureRecognizer *)tap{
NSLog(@”点击”);
}
(void)touchesBegan:(NSSet )touches withEvent:(UIEvent )event{
NSLog(@”begin”);
}
(void)touchesCancelled:(NSSet )touches withEvent:(UIEvent )event{
NSLog(@”cancel”);
}
(void)touchesEnded:(NSSet )touches withEvent:(UIEvent )event{
NSLog(@”end”);
}
(void)touchesMoved:(NSSet )touches withEvent:(UIEvent )event{
NSLog(@”touch”);
}
@end
cancelsTouchesInView/delaysTouchesBegan/delaysTouchesEnded
(0)首先要知道的是
1.这3个属性是作用于GestureRecognizers(手势识别)与触摸事件之间联系的属性。实际应用中好像很少会把它们放到一起,大多都只是运用手势识别,所以这3个属性应该很少会用到。 2.对于触摸事件,window只会有一个控件来接收touch。这个控件是首先接触到touch的并且重写了触摸事件方法(一个即可)的控件 3.手势识别和触摸事件是两个独立的事,只是可以通过这3个属性互相影响,不要混淆。
(1)在默认情况下(即这3个属性都处于默认值的情况下),如果触摸window,首先由window上最先符合条件的控件(该控件记为hit-test view)接收到该touch并触发触摸事件touchesBegan。同时如果某个控件的手势识别器接收到了该touch,就会进行识别。手势识别成功之后发送触摸事件touchesCancelled给hit-testview,hit-test view不再响应touch。
(2)cancelsTouchesInView:
默认为YES,这种情况下当手势识别器识别到touch之后,会发送touchesCancelled给hit-testview以取消hit-test view对touch的响应,这个时候只有手势识别器响应touch。
当设置成NO时,手势识别器识别到touch之后不会发送touchesCancelled给hit-test,这个时候手势识别器和hit-test view均响应touch。
(3)delaysTouchesBegan:
默认是NO,这种情况下当发生一个touch时,手势识别器先捕捉到到touch,然后发给hit-testview,两者各自做出响应。如果设置为YES,手势识别器在识别的过程中(注意是识别过程),不会将touch发给hit-test view,即hit-testview不会有任何触摸事件。只有在识别失败之后才会将touch发给hit-testview,这种情况下hit-test view的响应会延迟约0.15ms。
(4)delaysTouchesEnded:
默认为YES。这种情况下发生一个touch时,在手势识别成功后,发送给touchesCancelled消息给hit-testview,手势识别失败时,会延迟大概0.15ms,期间没有接收到别的touch才会发送touchesEnded。如果设置为NO,则不会延迟,即会立即发送touchesEnded以结束当前触摸。
*/
演示代码如下,读者自行拷贝尝试
MyViw继承自UIView:
import “MyView.h”
@implementation MyView- (void)touchesBegan:(NSSet )touches withEvent:(UIEvent )event{
NSLog(@”__begin”);
}
- (void)touchesCancelled:(NSSet )touches withEvent:(UIEvent )event{
NSLog(@”__cancel”);
}
- (void)touchesEnded:(NSSet )touches withEvent:(UIEvent )event{
NSLog(@”__end”);
}
- (void)touchesMoved:(NSSet )touches withEvent:(UIEvent )event{
NSLog(@”__touch”);
}
@end
import “ViewController.h”
import “MyView.h”
@interface ViewController ()@property (nonatomic, strong) MyView *myView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
_myView = [[MyView alloc]initWithFrame:CGRectMake(50, 50, [UIScreen mainScreen].bounds.size.width - 100, 200)];
_myView.backgroundColor = [UIColor yellowColor];
[self.view addSubview:_myView];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapAction:)];
tap.numberOfTapsRequired = 2;
[_myView addGestureRecognizer:tap];
}
- (void)tapAction:(UITapGestureRecognizer *)tap{
NSLog(@”点击”);
}
(void)touchesBegan:(NSSet )touches withEvent:(UIEvent )event{
NSLog(@”begin”);
}
(void)touchesCancelled:(NSSet )touches withEvent:(UIEvent )event{
NSLog(@”cancel”);
}
(void)touchesEnded:(NSSet )touches withEvent:(UIEvent )event{
NSLog(@”end”);
}
(void)touchesMoved:(NSSet )touches withEvent:(UIEvent )event{
NSLog(@”touch”);
}
@end
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