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];

}

}