iOS nav加角标

写一个类别加上就可以啦

#import "UIBarButtonItem+Badge.h"

#import "BadgeView.h"

#import <PureLayout/PureLayout.h>

 

@implementation UIBarButtonItem (Badge)

 

-(void)addBadgeWithNum:(NSNumber *)num{

    for (UIView *view in self.customView.subviews) {

        if ([view isKindOfClass:[BadgeView class]]) {

            [view removeFromSuperview];

        }

    }

    if (num>0) {

        BadgeView *badgeView  = [[BadgeView alloc]initWithNumber:num];

        [self.customView addSubview:badgeView];

        [badgeView autoPinEdgeToSuperviewEdge:ALEdgeRight withInset:8];

        [badgeView autoPinEdgeToSuperviewEdge:ALEdgeTop withInset:3];

    }

}