多点触控的两个视图

Question

我应该在我的主视图中管理两个不同的视图;我想检测视图中手指的确切数量，也就是说，如果我在第一个视图中有四个手指，我想要一个var值= 4，如果我在第二个视图中有三个手指，我想要另一个var值= 3。我给你看我的代码不能正常工作。

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:self.view];
    NSLog(@"cgpoint:%f,%f", touchLocation.x, touchLocation.y);
    if (CGRectContainsPoint(view1.frame, touchLocation)){
        NSLog(@"TOUCH VIEW 1");
        totalTouch1 = [[event allTouches]count];
        NSLog(@"TOTAL TOUCH 1:%d", totalTouch1); 
    }
    else if (CGRectContainsPoint(view2.frame, touchLocation)){
        NSLog(@"TOUCH VIEW 2");
        totalTouch2 = [[event allTouches]count];
        NSLog(@"TOTAL TOUCH 2:%d", totalTouch2);
     }
 }

在我的代码中，如果我开始把我的手指放在"first view"中，这没问题，但是如果我把我的第四个手指放在second view中我的代码输入第一个"if"并说我的手指还在first view中。我不明白这个问题。

Answer 1

[[event allTouches] anyObject];只获取一个触摸。

你需要遍历所有的触摸，像这样:

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    int touch1 = 0;
    int touch2 = 0;
    NSArray *touches = [[event allTouches] allObjects];
    for( UITouch *touch in touches ) {
        CGPoint touchLocation = [touch locationInView:self.view];
        NSLog(@"cgpoint:%f,%f", touchLocation.x, touchLocation.y);
        if (CGRectContainsPoint(view1.frame, touchLocation)){
            NSLog(@"TOUCH VIEW 1");
            touch1 += 1;
            NSLog(@"TOTAL TOUCH 1:%d", totalTouch1);
        }
        else if (CGRectContainsPoint(view2.frame, touchLocation)){
            NSLog(@"TOUCH VIEW 2");
            touch2 += 1;
            NSLog(@"TOTAL TOUCH 2:%d", totalTouch2);
        }
    }
    NSLog(@"Total touches on view 1: %d", touch1);
    NSLog(@"Total touches on view 2: %d", touch2);
}