首先引入文件：#import <QuartzCore/QuartzCore.h> 

再次执行类似下面的代码：

UIButton *moreButton = [UIButton buttonWithType:UIButtonTypeCustom];
moreButton.frame = CGRectMake(1.0f, 1.0f, cell.contentView.frame.size.width-2, cell.contentView.frame.size.height-2);
[moreButton.layer setMasksToBounds:YES];
[moreButton.layer setCornerRadius:10.0]; //设置矩形四个圆角半径
[moreButton.layer setBorderWidth:1.0]; //边框宽度
moreButton.backgroundColor = [UIColor clearColor];