ios - 如何仅在三个边上设置 UITextField 边框/CALayer 边框 ios

Question

我的文本字段需要一个边框，如下图所示。我该怎么做？

Answer 1

试试这些..我希望它能帮助...

UITextField *txt=[[UITextField alloc]initWithFrame:CGRectMake(10, 100, 150, 30)];
[txt setBackgroundColor:[UIColor clearColor]];
[txt setPlaceholder:@"Hello my friend"];
[self.view addSubview:txt];


CALayer *border = [CALayer layer];
CGFloat borderWidth = 2;
border.borderColor = [UIColor redColor].CGColor;
border.frame = CGRectMake(0, -2, txt.frame.size.width, txt.frame.size.height);
border.borderWidth = borderWidth;
[txt.layer addSublayer:border];
txt.layer.masksToBounds = YES;