UI07_Touch

本文主要是介绍UI07_Touch，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

创建一个根视图控制器

@implementation RootViewController#warning 在继承和使用父类的方法的时候,一般会先用super去调用父类相应的方法,目的是为了保证方法的原功能不变,在此基础上再添加我们自己的功能.(一).触摸
1.触摸开始.
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {[super touchesBegan:touches withEvent:event];NSLog(@"触摸开始");
}2.触摸移动.
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {[super touchesMoved:touches withEvent:event];NSLog(@"触摸移动");
}3.触摸结束.
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {[super touchesEnded:touches withEvent:event];NSLog(@"触摸结束");
}4.触摸取消(当来电话时,触摸自动取消).
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {[super touchesCancelled:touches withEvent:event];NSLog(@"触摸取消");
}

(二).摇一摇
1.晃动开始.
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event {[super motionBegan:motion withEvent:event];NSLog(@"晃动开始!~");// 设置随机背景颜色.(模拟器 -> Hardware -> Shake),模拟摇一摇改变背景颜色.self.view.backgroundColor = [UIColor colorWithRed:arc4random() % 256 / 255.0 green:arc4random() % 256 / 255.0 blue:arc4random() % 256 / 255.0 alpha:1];
}2.晃动结束.
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event {[super motionEnded:motion withEvent:event];NSLog(@"晃动结束!~");
}3.晃动取消.
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event {[super motionCancelled:motion withEvent:event];NSLog(@"晃动取消!~");
}

(三).在根视图控制器上移动视图.
新建MyView类,继承于UIView
MyView.m
#import "MyView.h"
@interface MyView ()1.创建一个属性,记录起点.
@property(nonatomic, assign)CGPoint startPoint;
@end
@implementation MyView// 开始
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {[super touchesBegan:touches withEvent:event];2.获取触摸对象.UITouch *touch = [touches anyObject];3.根据触摸对象,获取开始的坐标位置.self.startPoint = [touch locationInView:self];
}// 移动
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {[super touchesMoved:touches withEvent:event];4.获取触摸对象.UITouch *touch = [touches anyObject];5.获取移动的坐标位置.CGPoint newPoint = [touch locationInView:self];6.计算两个坐标产生的变化.CGFloat dx = newPoint.x - self.startPoint.x;CGFloat dy = newPoint.y - self.startPoint.y;7.改变自身变化.self.center = CGPointMake(self.center.x + dx, self.center.y + dy);}// 结束
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {[super touchesEnded:touches withEvent:event];
}// 回到RootViewController中创建一个视图.
RootViewController.m
- (void)viewDidLoad {// 为什么要单独创建一个类写方法的实现,然后再回到根视图控制器中创建视图,因为代码模块化,便于管理.MyView *firstView = [[MyView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];firstView.backgroundColor = [UIColor cyanColor];[self.view addSubview:firstView];[firstView release];}

(四).响应链问题
在根视图控制器中创建一个UIView和两个UIButton
RootViewController.m
- (void)viewDidLoad {1.创建一个视图.UIView *firstView = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 200, 200)];firstView.backgroundColor = [UIColor cyanColor];[self.view addSubview:firstView];[firstView release];2.创建第一个按钮.UIButton *firstButton = [UIButton buttonWithType:UIButtonTypeSystem];firstButton.frame = CGRectMake(0, 0, 100, 100);firstButton.backgroundColor = [UIColor redColor];[firstView addSubview:firstButton];[firstButton addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];3.创建第二个按钮.UIButton *secondButton = [UIButton buttonWithType:UIButtonTypeSystem];secondButton.frame = CGRectMake(150, 150, 100, 100);secondButton.backgroundColor = [UIColor blueColor];[firstView addSubview:secondButton];[secondButton addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
}4.使这两个按钮同时绑定同一个方法.
- (void)click:(UIButton *)button {NSLog(@"****************");
}我们可以发现当鼠标点击按钮与视图的重合区域时,会触发click方法,其他不会触发,这就是响应链的问题.

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