Question

我在视图控制器中有以下代码：

@interface QuizController ()

@property (weak, nonatomic) IBOutlet UITextView *questionText;
@property (weak, nonatomic) IBOutlet UITextView *one;
@property (weak, nonatomic) IBOutlet UITextView *two;
@property (weak, nonatomic) IBOutlet UITextView *three;
@property (weak, nonatomic) IBOutlet UITextView *four;

@property(strong, nonatomic) NSMutableArray* possAnswers;
@end

@implementation QuizController

- (void)viewDidLoad {
   [super viewDidLoad];
   [self.manager setupGame];
   self.possAnswers = [[NSMutableArray alloc] initWithObjects:@"a", @"b", @"c", @"d", nil];

}

//This listens for a tap on any of the TextViews and sets the background to Blue 

- (IBAction)fourTapped:(id)sender {
    NSLog(@"There's been a tap!");
    [self blankBoxes];

    if( [sender isKindOfClass:[UITapGestureRecognizer class]] )
    {

        UITapGestureRecognizer* tgr = (UITapGestureRecognizer*)sender;
        UIView* view = tgr.view;
        if( [view isKindOfClass:[UITextView class]]){
            UITextView* tv = (UITextView*)view;
            NSLog([tv text]);
            [tv setBackgroundColor:[UIColor blueColor]];
        }

    }

}

-(void)blankBoxes
{
  [_one setBackgroundColor:[UIColor whiteColor]];
  [_two setBackgroundColor:[UIColor whiteColor]];
  [_three setBackgroundColor:[UIColor whiteColor]];
  [_four setBackgroundColor:[UIColor whiteColor]];
}

但是，无论哪个视图被点按，唯一突出显示的UITextView都是_one。我不明白为什么会这样。如果有人能指出这一点，我真的很感激。

Answer 1

手势识别器附加到一个且仅一个视图。这是设计的。如果您想要一个让您识别多个视图上的点击的手势识别器，则必须将其附加到一个通用的封闭式超视图，然后查看点击坐标并确定点击了哪个视图。

通常，您只需为需要响应水龙头的每个视图创建不同的手势识别器。

Answer 2

将UIGestureRecognizer添加到包含您的子视图的UIView。之后，使用CGRectContainsPoint()检查点击位置是否位于其中一个子视图中，然后从那里继续。

CGPoint *touchLocation = [gesture locationInView:self];

for(UIView *view in self.subviews){

     if(CGRectContainsPoint(view.frame, touchLocation))
        //Your code here


}

UITap手势仅适用于一个视图

2 个答案: