UIButton *signBtn = [UIButton buttonWithType:UIButtonTypeCustom];    signBtn.frame = CGRectMake(0, 0, 80, 40);    [signBtn.layer setMasksToBounds:YES];    [signBtn.layer setCornerRadius:10.0]; //设置矩形四个圆角半径    [signBtn.layer setBorderWidth:1.0]; //边框宽度    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();    CGColorRef colorref = CGColorCreate(colorSpace,(CGFloat[]){ 1, 0, 0, 1 });     [signBtn.layer setBorderColor:colorref];//边框颜色    [signBtn setTitle:@"还  原" forState:UIControlStateNormal];//button title    [signBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];//title color    [signBtn addTarget:self action:@selector(buttonDonwRecover:) forControlEvents:UIControlEventTouchUpInside];//button 点击回调方法    signBtn.backgroundColor = [UIColor whiteColor];    - (void)buttonDonwRecover:(id)sender    {        UIButton *btn = (UIButton *)sender;    }