UI总结-事件(UIResponder的方法)

自己写的View上面添加了事件,MyView.m文件:

#import "MyView.h"

@interface MyView ()

@property(nonatomic, assign)CGPoint point;

@end

@implementation MyView

//UITouch触摸事件处理

//触摸开始的方法-(void)touchesBegan:(NSSet*)touches withEvent:(UIEvent *)event{   

 //获取当前触摸的坐标        

//获取坐标前先获取touch对象    

UITouch *touch  = [touches anyObject];    

self.point = [touch locationInView:self];    

NSLog(@"%g", self.point.x);

}

//移动的偏移量的方法

-(void)touchesMoved:(NSSet*)touches withEvent:(UIEvent *)event{    

//获取touch对象    

UITouch *touch = [touches anyObject];    

CGPoint newPoint = [touch locationInView:self];    

//计算起始和过程的变化    

CGFloat x = newPoint.x - self.point.x;   

 CGFloat y = newPoint.y - self.point.y;    

//修改变化的坐标    

self.center = CGPointMake(self.center.x + x, self.center.y + y);

}

//触摸结束的方法

-(void)touchesEnded:(NSSet*)touches withEvent:(UIEvent *)event{

[super touchesEnded:touches withEvent:event];

UIView *view = self.superview;

NSLog(@"%g", view.frame.size.width);

//添加动画让试图移动到指定的位置

if (self.center.y < view.frame.size.height / 2) {

[UIView animateWithDuration:1 animations:^{

self.center = CGPointMake(self.center.x, self.frame.size.height / 2);

}];

}else if (self.center.y > view.frame.size.height / 2){

[UIView animateWithDuration:1 animations:^{

self.center = CGPointMake(self.center.x, 705 - self.frame.size.height);

}];

}

}

在RootViewController.m文件中:

#import "RootViewController.h"

#import "MyView.h"

@interface RootViewController ()

@end

@implementation RootViewController

- (void)viewDidLoad {    

[super viewDidLoad];    

// Do any additional setup after loading the view.    

MyView *redView = [[MyView alloc]initWithFrame:CGRectMake(100, 100, 200, 200)];    redView.backgroundColor = [UIColor redColor];   

 [self.view addSubview:redView];    

[redView release];        

UITextField *textf = [[UITextField alloc]initWithFrame:CGRectMake(0, 180, 100, 50)];    textf.backgroundColor = [UIColor orangeColor];   

 [redView addSubview:textf];    

textf.tag = 1;

}

//摇一摇事件

-(void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event{   

 NSLog(@"摇一摇开始");   

 //给View设置随意的背景颜色   

 self.view.backgroundColor = [UIColor colorWithRed:arc4random()%256 /255.0 green:arc4random()% 256 /255.0 blue:arc4random()% 256 /255.0 alpha:1];

}

-(void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event{    

NSLog(@"摇一摇");

}

-(void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event{    

NSLog(@"摇一摇结束");

}

-(void)touchesBegan:(NSSet*)touches withEvent:(UIEvent *)event{    

NSLog(@"触摸开始");    

UITextField *text = (UITextField *)[self.view viewWithTag:1];    

[text resignFirstResponder];

}

-(void)touchesMoved:(NSSet*)touches withEvent:(UIEvent *)event{    

NSLog(@"触摸移动");

}

-(void)touchesEnded:(NSSet*)touches withEvent:(UIEvent *)event{

NSLog(@"触摸结束");

}

当运行时,你只要鼠标碰到到MyView就会触发触摸事件,打印鼠标点位置的x值和父试图的宽度.如图:

当你对虚拟机进行摇一摇是,就会执行摇一摇事件.如图: