Question

我尝试从UIView获取所有按钮。我试过这段代码，但它没有用。

for (UIView *subview in self.view.subviews)
{
    if ([subview isKindOfClass:[UIButton class]]
    {
        NSLog(@"found a button!");
        subview.layer.borderWidth = 1.0f;
        subview.layer.borderColor = [[UIColor whiteColor] CGColor];
        [subview.layer setCornerRadius: subview.frame.size.width/2.0f];
        NSLog(@"button.tag = %ld", (long)subview.tag);
    }
}

请帮忙。

Answer 1

使用此代码：

- (void)getAllButtonFromView:(UIView*)view {
    for (UIView* subview in view.subviews) {

        if (subview.subviews.count > 0) {
            [self getAllButtonFromView:subview];
        }        
        else if ([subview isKindOfClass:[UIButton class]]) {

            NSLog(@"found a button!");
            subview.layer.borderWidth = 1.0f;
            subview.layer.borderColor = [[UIColor whiteColor] CGColor];
            [subview.layer setCornerRadius: subview.frame.size.width/2.0f];
            NSLog(@"button.tag = %ld", (long)subview.tag);
        }
    }
}

问题可能是您的按钮没有直接添加到视图中，实际上它们会添加到视图的子视图中。因此，只需检查view.subviews中子视图中的视图是否包含包含UIButton的子视图。

Answer 2

我认为这个片段可以解决您的问题

for (UIView *subview in self.view.subviews)
        {
            if ([subview isKindOfClass:[UIButton class]])

                {
                    NSLog(@"found a button!");
                    subview.layer.borderWidth = 1.0f;
                    subview.layer.borderColor = [[UIColor whiteColor] CGColor];
                    [subview.layer setCornerRadius: subview.frame.size.width/2.0f];
                    NSLog(@"button.tag = %ld", (long)subview.tag);
                }

            if( [subview isKindOfClass:[UIView class]])
            {
                for(UIView *furtherView in subview.subviews)
                {
                    if ([furtherView isKindOfClass:[UIButton class]])

                    {
                        NSLog(@"found a button!");
                        subview.layer.borderWidth = 1.0f;
                        subview.layer.borderColor = [[UIColor whiteColor] CGColor];
                        [subview.layer setCornerRadius: subview.frame.size.width/2.0f];
                        NSLog(@"button.tag = %ld", (long)subview.tag);
                    }
                }

            }

        }

Answer 3

SWIFT 5.2

for subview in self.view.subviews {
    if subview is UIButton {
        let button = subview as! UIButton
        // do smth with a button
        button.setBackgroundImage(nil, for: .normal)
        button.isUserInteractionEnabled = true
    }
}

如何从视图中获取所有按钮？

3 个答案: