边框颜色为 tintColor 的 UIButton

创建一个 UIButton 的子类，重写其方法：

- (void)drawRect:(CGRect)rect
{[[self layer] setCornerRadius:CORNER_RADIUS];[[self layer] setMasksToBounds:YES];   [[self layer] setBorderWidth:1];[[self layer] setBorderColor:self.tintColor.CGColor];[self.imageView setTintColor:self.tintColor];
}- (void)tintColorDidChange {[super tintColorDidChange];[self setNeedsDisplay];
//    [[self layer] setBorderColor:self.tintColor.CGColor];
}