IOS UIView 设置单边实现

- (void)setBorderWithView:(UIView *)view top:(BOOL)top left:(BOOL)left bottom:(BOOL)bottom right:(BOOL)right borderColor:(UIColor *)color borderWidth:(CGFloat)width {

if (top) { CALayer *layer = [CALayer layer];

layer.frame = CGRectMake(0, 0, view.frame.size.width, width);

layer.backgroundColor = color.CGColor;

[view.layer addSublayer:layer];

}

if (left) {

CALayer *layer = [CALayer layer];

layer.frame = CGRectMake(0, 0, width, view.frame.size.height);

layer.backgroundColor = color.CGColor;

[view.layer addSublayer:layer];

}

if (bottom) {

CALayer *layer = [CALayer layer];

layer.frame = CGRectMake(0, view.frame.size.height - width, view.frame.size.width, width);

layer.backgroundColor = color.CGColor;

[view.layer addSublayer:layer];

}

if (right) {

CALayer *layer = [CALayer layer];

layer.frame = CGRectMake(view.frame.size.width - width, 0, width, view.frame.size.height);

layer.backgroundColor = color.CGColor;

[view.layer addSublayer:layer];

}

}