分割线

对于一些没有事件响应的视图，比如分割线，我们可以直接添加layer来达到显示效果：

#import <UIKit/UIKit.h>@interface UIView (HTExtension)- (void)addLineLayerWithX:(CGFloat)x Y:(CGFloat)y Width:(CGFloat)width Height:(CGFloat)height Color:(UIColor *)color;@end

#import "UIView+HTExtension.h"@implementation UIView (HTExtension)- (void)addLineLayerWithX:(CGFloat)x Y:(CGFloat)y Width:(CGFloat)width Height:(CGFloat)height Color:(UIColor *)color{    CALayer * lineLayer = [CALayer layer];    lineLayer.position = CGPointMake(x, y);    lineLayer.anchorPoint = CGPointZero;    lineLayer.bounds = CGRectMake(0, 0, width, height);    lineLayer.backgroundColor = color.CGColor;    [self.layer addSublayer:lineLayer];}@end