监听tabBarButton这个私有类的点击方法

双击tabBarButton时候会用到 UIControlEventTouchDownRepeat 这个按钮点击模式 !!!

#import "BaseTabBar.h"

@interface BaseTabBar ()
@property (nonatomic , weak) UIButton *publishButton ;
//上一次点击的按钮:
@property (nonatomic , strong) UIControl *previousClickTabBarButton ;

@end

@implementation BaseTabBar

#pragma mark - lazyLoad
- (UIButton *)publishButton {
    if (!_publishButton) {
        UIButton *publishButton = [UIButton buttonWithType:UIButtonTypeCustom] ;
        [publishButton setBackgroundImage:[UIImage imageNamed:@"tabBar_publish_icon"] forState:UIControlStateNormal] ;
        [publishButton setBackgroundImage:[UIImage imageNamed:@"tabBar_publish_click_icon"] forState:UIControlStateHighlighted] ;
        [publishButton sizeToFit] ;
        _publishButton = publishButton ;
        [self addSubview:_publishButton] ;
    }
    return _publishButton ;
}

#pragma mark - layoutSubviews
- (void)layoutSubviews {
    [super layoutSubviews] ;
    NSInteger count = self.items.count + 1 ;
    CGFloat buttonW = self.width / count ;
    CGFloat buttonH = self.height ;
    CGFloat buttonY = 0 ;
    CGFloat buttonX = 0 ;
    NSInteger i = 0 ;
    for (UIControl *tabBarButton in self.subviews) {
        //遍历私有属性:UITabBarButton只能用 NSClassFromString 方法:
        if ([tabBarButton isKindOfClass:NSClassFromString(@"UITabBarButton")]) {
            //一进入程序就让精华按钮处于被点击一次的状态:
            //layoutSubviews会被调用多次 , 如果只是i == 0 判断不够严谨 ;
            if (i == 0 && self.previousClickTabBarButton == nil) {
                self.previousClickTabBarButton = tabBarButton ;
            }
            
            if (i == 2) i += 1 ;
            buttonX = i * buttonW ;
            //系统的UITabBarButton的高度就是48 , 所以我这里也修改一下
            tabBarButton.frame = CGRectMake(buttonX, buttonY, buttonW, buttonH - buttonY) ;
            i++ ;
            
            //监听点击:
            //因为 UITabBarButton 是UITabBar的私有类 , 不能遍历特定该属性 ;如果还是UIView就不能addTarget:方法 ;所以找到 tabBarButton.superclass 继承自UIControl ;
            [tabBarButton addTarget:self action:@selector(tabBarButtonAction:) forControlEvents:UIControlEventTouchUpInside | UIControlEventTouchDownRepeat] ;
            
        }
    }
    self.publishButton.center = CGPointMake(self.width * 0.5, self.height * 0.5) ;
    NSLog(@"%@" , self.subviews) ;
    
}

- (void)tabBarButtonAction:(UIControl *)tabBarButton {
    //判断为重复点击上一次的按钮:
    if (self.previousClickTabBarButton == tabBarButton) {
        DebugLog ;
    }
    //把上一次点击的按钮存起来:
    self.previousClickTabBarButton = tabBarButton ;
    
}

@end

愿编程让这个世界更美好