UIGestureRecognizerDelegate 实现不起作用

Question

我试图在我的 ViewController 中实现 UIGestureRecognizerDelegate，但不知何故没有调用这些方法。这是控制器：

#import "DiaryEntryViewController.h"
#import "UINavigationController+BarManagement.h"

@interface DiaryEntryViewController ()<UIGestureRecognizerDelegate>
@property (strong, nonatomic) NSManagedObjectContext *managedObjectContext;
@property (weak, nonatomic) IBOutlet UITextView *textView;

@end

@implementation DiaryEntryViewController

-(void)viewWillAppear:(BOOL)inAnimated{
    [super viewWillAppear:inAnimated];
    self.navigationController.barsHidden = NO;
}

-(void)viewDidAppear:(BOOL)inAnimated{
    [super viewDidAppear:inAnimated];
    [self.navigationController hideBarsWithDelay:2.0];
}

-(void)viewWillDisappear:(BOOL)inAnimated{
    [self.navigationController setBarsHidden:NO animated:YES];
    [super viewWillDisappear:inAnimated];
}

-(NSManagedObjectContext *)managedObjectContext{
    return self.diaryEntry.managedObjectContext;
}

-(BOOL)saveDiaryEntry{
    BOOL theResult = NO;
    NSError *theError = nil;

    theResult = [self.managedObjectContext save:&theError];
    if(!theResult){
        NSLog(@"saveItem %@", theError);
    }

    return theResult;
}

-(CGRect)visibleBounds{
    CGRect theBounds = self.view.bounds;

    if([self respondsToSelector:@selector(topLayoutGuide)] && [self respondsToSelector:@selector(bottomLayoutGuide)]){
        theBounds.origin.y = [self.topLayoutGuide length];
        theBounds.size.height -= [self.topLayoutGuide length] + [self.bottomLayoutGuide length];
    }
    return theBounds;
}

-(IBAction)toogleBars:(id)sender{
    NSLog(@"toogleBars");
    UINavigationController *theController = self.navigationController;
    BOOL theHiddenFlag = theController.barsHidden;

    [theController setBarsHidden:!theHiddenFlag animated:YES];
    if(theHiddenFlag){
        [theController hideBarsWithDelay:2.0];
    }

}

-(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)inRecognizer{
    NSLog(@"gestureRecognizerShouldBegin");
    UIView *theView = self.textView;
    CGPoint thePoint = [inRecognizer locationInView:theView];

    return !CGRectContainsPoint(theView.bounds, thePoint);
}

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    NSLog(@"bla");

    return YES;
}

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRequireFailureOfGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    NSLog(@"ble");
    return YES;
}

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    NSLog(@"blä");
    return YES;
}

@end

它确实调用了 toogleBars 方法，但是 none 识别器方法。

Answer 1

不要忘记声明识别器并将其添加到要检测点击或滑动的视图

示例：

将属性添加到 VC。

分配并初始化识别器：

self.theTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(someMethod:)];
self.theTapRecognizer.delegate = self;
[someView addGestureRecognizer: selftheTapRecognizer];

someView 是您要在其中初始化该识别器的视图的占位符文本，它可以是整个 self.view 或某些子视图，您可以使用以下委托方法监听与该手势识别器的任何交互

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch

Answer 2

假设你已经从故事板中添加了UIGestureRecognizer，你需要记得CTRL + 拖动手势对象到UIViewController黄色圆圈图像并设置委托。

您的 UIGestureRecognizer 对象将位于 UIViewController 视图的顶部。 CTL 把这个拖到黄色圆圈ViewController icon

然后此弹出窗口将显示 select 'Delegate' 以便 gesutureRecognizer 将使用委托方法。

UIGestureRecognizerDelegate 实现不起作用

UIGestureRecognizerDelegate implemenation doesn't work

xcode

objective-c

ios

ios8