如何在UIbuttons上编程添加UIview
如何在UIbuttons上编程添加UIview
提问于 2014-12-23 07:08:16
我已经通过编程创建了一个视图，并希望在该视图上添加2个按钮，但是在运行app视图时，它上的按钮不会出现。这里是我的示例代码，似乎问题在于框架，但如何根据框架调整按钮帧：
cv = [[UIView alloc]initWithFrame:CGRectMake(200, 60, 100, 80)];
UIButton *label1 = [[UIButton alloc]initWithFrame:CGRectMake(100,90, 200, 30)];
label1=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[label1 setTitle: @"Mark as unread" forState: UIControlStateNormal];
label1.titleLabel.font=[UIFont fontWithName:@"SegoeUI" size:12.0];
[label1 addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
label1.backgroundColor=[UIColor blackColor];
[cv addSubview:label1];
UIButton *label2 = [[UIButton alloc]initWithFrame:CGRectMake(-50,20, 200, 30)];
[label2 setTitle: @"Mark as read" forState: UIControlStateNormal];
label2=[UIButton buttonWithType:UIButtonTypeRoundedRect];
label2.titleLabel.font=[UIFont fontWithName:@"SegoeUI" size:12.0];
[label2 addTarget:self action:@selector(nonbuttonClicked:) forControlEvents:UIControlEventTouchUpInside];
[cv addSubview:label2];回答 1
Stack Overflow用户
回答已采纳
发布于 2014-12-23 07:14:23
首先，尝试这段代码，我只是删除了按钮式设置行。
UIButton *label1 = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 100, 30)];
//label1=[UIButton buttonWithType:UIButtonTypeRoundedRect];
UIButton *label2 = [[UIButton alloc]initWithFrame:CGRectMake(0, 40, 100, 30)];
//label2=[UIButton buttonWithType:UIButtonTypeRoundedRect];原因：label1是按照第一行中的框架创建的，而在下一行中，label1被重新分配给由buttonWithType方法创建的新按钮实例。因此，它被覆盖在已经设置了框架的第一个实例上。
因此，您的代码将变成这样：
cv = [[UIView alloc]initWithFrame:CGRectMake(200, 60, 100, 80)];
UIButton *label1 = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 100, 30)];
[label1 setTitle: @"Mark as unread" forState: UIControlStateNormal];
label1.titleLabel.font=[UIFont fontWithName:@"SegoeUI" size:12.0];
[label1 addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
label1.backgroundColor=[UIColor blackColor];
[cv addSubview:label1];
UIButton *label2 = [[UIButton alloc]initWithFrame:CGRectMake(0, 40, 100, 30)];
[label2 setTitle: @"Mark as read" forState: UIControlStateNormal];
label2.titleLabel.font=[UIFont fontWithName:@"SegoeUI" size:12.0];
[label2 addTarget:self action:@selector(nonbuttonClicked:) forControlEvents:UIControlEventTouchUpInside];
[cv addSubview:label2];页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/27615635
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