[TwistedFate]觸摸事件 晃動事件 target/action

觸摸事件的方法

創建TouchView類 並在根視圖控制器裏初始化
類裏 添加觸摸事件響應方法

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"開始摸");
    // UITouch保存手指的信息 例如觸摸的點
//    UITouch *touch = [touches anyObject];
//    //NSLog(@"%@",touch);
//    
//    // 取出當前觸摸的點 相當於傳進去的參數View
//    CGPoint p1 = [touch locationInView:self];

//    NSLog(@"%@",NSStringFromCGPoint(p1));

    // 返回當前點的上一個點 相對於傳進去的參數View
//    CGPoint p2 = [touch previousLocationInView:self];
//    NSLog(@"%@",NSStringFromCGPoint(p2));
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"移動中");
    // 取出當前點
    // 取出當前點上一個點
    // 計算X軸的偏移量
    // 計算Y軸的偏移量
    // 偏移量
    UITouch *touch = [touches anyObject];
    CGPoint p1 = [touch previousLocationInView:self];
    CGPoint p2 = [touch locationInView:self];
    CGFloat x = p2.x - p1.x;
    CGFloat y = p2.y - p1.y;
    self.center = CGPointMake(self.center.x + x, self.center.y + y);
    CGFloat blue = (arc4random() % 256 / 255.0);
    CGFloat red = (arc4random() % 256 / 255.0);
    CGFloat green = (arc4random() % 256 / 255.0);
    self.backgroundColor = [UIColor colorWithRed:red green:green blue:blue alpha:(arc4random() % 2 / 1.0)];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"撫摸結束");
}
-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"觸摸被中斷,例如觸摸中 來電話可以中斷,小退出");
}

晃動事件

// 晃動事件
// 開始晃動
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event{
    NSLog(@"開始晃動了");
}
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event{
    NSLog(@"結束晃動");
    // 跳轉界面
    SecondViewController *secondVC = [[SecondViewController alloc] init];
    // 跳轉
    // 模態視圖跳轉
    // 無層級跳轉 *******
    [self presentViewController:secondVC animated:YES completion:nil];
}
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event{
    NSLog(@"中斷晃動");
}

target/action

使UIView擁有類似於UIButton的方法
創建ButtonView類
// buttonView.h文件

@property (nonatomic, retain) id target;
@property (nonatomic, assign) SEL action;
- (instancetype)initWithFrame:(CGRect)frame target:(id)target action:(SEL)action;

// buttonView.m文件

- (instancetype)initWithFrame:(CGRect)frame target:(id)target action:(SEL)action{
    self = [super initWithFrame:frame];
    if (self) {
        self.target = target;
        self.action = action;
    }
    return self;
}



// 開始觸摸
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"開始");


}
// 移動觸摸
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"觸摸中");

}
// 結束觸摸
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"點擊結束");
    // 使用self.target對象調用action方法
    // 讓一個對象去掉用類裏的方法
    // Object 可攜帶的參數 ******
    [self.target performSelector:self.action withObject:self];
}
// 中斷觸摸
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"中斷");
}

RootViewController.m文件

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    ButtonView *buttonView = [[ButtonView alloc] initWithFrame:CGRectMake(100, 100, 100, 100) target:self action:@selector(buttonViewClicked:)];
    buttonView.backgroundColor = [UIColor redColor];
    [self.view addSubview:buttonView];
    [buttonView release];
}
- (void)buttonViewClicked:(UIView *)view{
    view.backgroundColor = [UIColor cyanColor];
}