IOS UIView 设置单边实现

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- (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];
    }
}

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