ios UIKit框架分析 第3天

1.UIGestureRecognizer--关于ios的常见手势简述

－》父类

UIGestureRecognizer 是一个抽象类，是所有手势事件的父类。

The concrete subclasses of UIGestureRecognizer are the following:

UITapGestureRecognizer //轻拍
UIPinchGestureRecognizer //捏合
UIRotationGestureRecognizer //旋转
UISwipeGestureRecognizer //扫
UIPanGestureRecognizer//拖拽
UILongPressGestureRecognizer //长按

- (void)requireGestureRecognizerToFail:(UIGestureRecognizer *)otherGestureRecognizer;

手势共从的问题，otherGestureRecognizer实效时才执行当前手势－－ 参考：http://shiminghua234.blog.163.com/blog/static/2639124220135842541889/

// 单击的 Recognizer
    UITapGestureRecognizer* singleRecognizer;
    singleRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleSingleTapFrom)];
    singleTapRecognizer.numberOfTapsRequired = 1; // 单击
    [self.view addGestureRecognizer:singleRecognizer];
    
    // 双击的 Recognizer
    UITapGestureRecognizer* double;
    doubleRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleDoubleTapFrom)];
    doubleTapRecognizer.numberOfTapsRequired = 2; // 双击
    [self.view addGestureRecognizer:doubleRecognizer];
    
    // 关键在这一行，如果双击确定偵測失败才會触发单击
    [singleRecognizer requireGestureRecognizerToFail:doubleRecognizer];
    [singleRecognizer release];
    [doubleRecognizer release];

iOS7 -- 新特征

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRequireFailureOfGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizerNS_AVAILABLE_IOS(7_0);

返回值为yes，gestureRecognizer  让 otherGestureRecognizer实效。返回no，两者没有关联效果。

举例说明，当在app屏幕边缘的某个View pan时候，你可能希望这个view的所有子view的recognizer都失败，不再工作，否则可能会发生图像闪烁。
要达到这个目的，你可以这样来做

UIScreenEdgePanGestureRecognizer *myScreenEdgePanGestureRecognizer;
    myScreenEdgePanGestureRecognizer = [[UIScreenEdgePanGestureRecognizer alloc]
                                        initWithTarget:self action:@selector(handleScreenEdgePan:)];
    myScreenEdgePanGestureRecognizer.delegate = self;
    // Configure the gesture recognizer and attach it to the view.

 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    Appearance and Behavior
    Using Gesture Recognizers
    BOOL result = NO;
    if ((gestureRecognizer == myScreenEdgePanGestureRecognizer) &&
        [[otherGestureRecognizer view] isDescendantOfView:[gestureRecognizer view]]) {
        result = YES;
    }
    return result;
}

与上一个函数效果刚刚相反
返回值为yes，otherGestureRecognizer   让 gestureRecognizer 实效。返回no，两者没有关联效果。

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizerNS_AVAILABLE_IOS(7_0);

－》UITapGestureRecognizer

numberOfTapsRequired ：设置轻击的次数，默认值为1

numberOfTouchesRequired ：触点的数量，默认值为1，即手指数

－》UIPinchGestureRecognizer

当两个手指靠近表示zoom-in，当两个手指分离表示zoom-out。

@property(nonatomic) CGFloat scale，放大缩小因子

@property(nonatomic, readonly) CGFloat velocity ，只读属性 ，表示移动速度

－》UIRotationGestureRecognizer

rotation ：旋转角度
velocity ：速度

－》UILongPressGestureRecognizer

minimumPressDuration ：长按最短的时间
numberOfTouchesRequired ：触点的数量
numberOfTapsRequired ：轻击的次数
allowableMovement ：长按时运行移动的最大距离，默认值为10个像素

-> UIPanGestureRecognizer

maximumNumberOfTouches :最大触摸的数量
minimumNumberOfTouches ：最少触摸的数量

- (CGPoint)translationInView:(UIView *)view

返回参数：该方法返回在横坐标上、纵坐标上拖动了多少像素  x方向：向右point.x 为正，向左为负，y轴同x轴；

- (void)setTranslation:(CGPoint)translation inView:(UIView *)view;

 self.imageView  = [[UIImageView alloc]initWithFrame:CGRectMake(10, 20, 30, 30)];
    self.imageView.image = [UIImage imageNamed:@"10yuan"];
    
    UIPanGestureRecognizer * panGesture = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(handlePan:)];
    [self.imageView addGestureRecognizer:panGesture];
    [self.imageView setUserInteractionEnabled:YES];
    
    [self.view addSubview:self.imageView];

因为拖动起来一直是在递增，所以每次都要用setTranslation:方法制0这样才不至于不受控制般滑动出视图

-(void)handlePan:(UIPanGestureRecognizer*)pan
{
    CGPoint point = [pan translationInView:self.view];
    NSLog(@"%f,%f",point.x,point.y);
    pan.view.center = CGPointMake(pan.view.center.x + point.x, pan.view.center.y + point.y);
    [pan setTranslation:CGPointMake(0, 0) inView:self.view];
}

（手势的速度，这是表示在每分每秒。速度分解为水平和垂直分量。）

- (CGPoint)velocityInView:(UIView *)view

－》UISwipeGestureRecognizer

direction ：扫动方向，默认值UISwipeGestureRecognizerDirectionRight

typedef enum {
UISwipeGestureRecognizerDirectionRight = 1 << 0,
UISwipeGestureRecognizerDirectionLeft = 1 << 1,
UISwipeGestureRecognizerDirectionUp = 1 << 2,
UISwipeGestureRecognizerDirectionDown = 1 << 3
} UISwipeGestureRecognizerDirection;

numberOfTouchesRequired ： 触点的数量，默认值为1，即手指数

2.UIMenuController--自定义弹出菜单

－》弹出菜单的视图必须成为第一响应者

-(BOOL)canBecomeFirstResponder
{
    return YES;
}

-(void)action
{
    if([self becomeFirstResponder]){
        NSLog(@"yes");
    }
    UIMenuItem *flag = [[UIMenuItem alloc] initWithTitle:@"Flag"action:@selector(flag:)];
    UIMenuItem *approve = [[UIMenuItem alloc] initWithTitle:@"Approve"action:@selector(approve:)];
    UIMenuItem *deny = [[UIMenuItem alloc] initWithTitle:@"Deny"action:@selector(deny:)];
    UIMenuController *menu = [UIMenuController sharedMenuController];
    [menu setMenuItems:[NSArray arrayWithObjects:flag, approve, deny, nil]];
    [menu setTargetRect:_btn.frame inView:self.view];
    [menu setMenuVisible:YES animated:YES];
    [menu setArrowDirection:UIMenuControllerArrowRight];
}
- (void)flag:(id)sender {
    NSLog(@"Cell was flagged");
}
- (void)approve:(id)sender {
    NSLog(@"Cell was approved");
}
- (void)deny:(id)sender {
    NSLog(@"Cell was denied");
}

3.UIInterpolatingMotionEffect--ios7.0

使物体随着设备移动而移动

- (void)viewDidLoad {
    [super viewDidLoad];

    [self registerEffectForView:_btn depth:100.0f];

}

- (void)registerEffectForView:(UIView*)_effectView depth:(CGFloat)_depthF
{
    
    
    effectX = [[[UIInterpolatingMotionEffect alloc]initWithKeyPath:@"center.x" type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis]retain];
    
    effectY = [[[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.y" type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis]retain];
    
    effectX.maximumRelativeValue = @(_depthF);
    
    effectX.minimumRelativeValue = @(-_depthF);
    
    effectY.maximumRelativeValue = @(_depthF);
    
    effectY.minimumRelativeValue = @(-_depthF);
    
    [_effectView addMotionEffect:effectX];
    
    [_effectView addMotionEffect:effectY];
}