设计思路：给UIView增加一个分类 所有的视图都可以根据需要来进行红点显示
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#import <UIKit/UIKit.h>@interface UIView (CHRRedDot)@property (readonly, nonatomic) CALayer * chr_redDotLayer;/** 红点圆心的位置，与各个边之间的距离。如果距离<=0，则忽略距离 */@property (nonatomic, assign) UIEdgeInsets chr_redDotEdgeInsets;/** 红点的半径，默认为4 */@property (nonatomic, assign) CGFloat chr_redDotRadius;/** 红点的颜色，默认为0xFF5A5A */@property (nonatomic, strong) UIColor * chr_redDotColor;/** 红点是否显示 */@property (nonatomic, assign) BOOL chr_redDotShow;@end#pragma mark - method- (void)chr_updateRedDot { CALayer *redDot = self.chr_redDotLayer; if (self.chr_redDotShow) { if (redDot == nil) { redDot = [CALayer layer]; self.chr_redDotLayer = redDot; [self.layer addSublayer:redDot]; } redDot.backgroundColor = self.chr_redDotColor.CGColor; [self chr_layoutRedDot]; } else { [redDot removeFromSuperlayer]; self.chr_redDotLayer = nil; }}- (void)chr_layoutRedDot { CALayer *redDot = self.chr_redDotLayer; if (redDot == nil) return; CGFloat radius = self.chr_redDotRadius; redDot.cornerRadius = radius; UIEdgeInsets edgeInsets = self.chr_redDotEdgeInsets; CGFloat originX = edgeInsets.right <= 0 ? edgeInsets.left - radius : self.bounds.size.width - edgeInsets.right + radius; CGFloat originY = edgeInsets.bottom <= 0 ? edgeInsets.top - radius : self.bounds.size.height - edgeInsets.bottom + radius; CGFloat length = radius * 2; redDot.frame = CGRectMake(originX, originY, length, length);} |
以上所述是小编给大家介绍的iOS中类似微信红点显示功能，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！
原文链接：http://www.cnblogs.com/rongStep/archive/2016/12/18/6193683.html
