iOS自定义UITabBar中间按钮

//// YLTabBar.h// 自定义tabbar//// Created by nyl on 2018/10/15.// Copyright © 2018年 nieyinlong. All rights reserved.// #import <UIKit/UIKit.h>//tab页面个数typedef NS_ENUM(NSInteger, kTbaBarItemUIType) { kTbaBarItemUIType_Three = 3,//底部3个选项 kTbaBarItemUIType_Five = 5,//底部5个选项}; @class YLTabBar; @protocol YLTabBarDelegate <NSObject> -(void)tabBar:(YLTabBar *)tabBar clickCenterButton:(UIButton *)sender; @end  @interface YLTabBar : UITabBar @property (nonatomic, weak) id<YLTabBarDelegate> tabDelegate;@property (nonatomic, strong) NSString *centerBtnTitle;@property (nonatomic, strong) NSString *centerBtnIcon; + (instancetype)instanceCustomTabBarWithType:(kTbaBarItemUIType)type; @end

//// YLTabBar.m// 自定义tabbar//// Created by nyl on 2018/10/15.// Copyright © 2018年 nieyinlong. All rights reserved.// #import "YLTabBar.h" @interface YLTabBar() @property(nonatomic, strong) UIButton *centerButton;@property(nonatomic, strong) UILabel *centerTitle;@property (nonatomic,assign) kTbaBarItemUIType type; @end @implementation YLTabBar +(instancetype)instanceCustomTabBarWithType:(kTbaBarItemUIType)type{ YLTabBar *tabBar = [[YLTabBar alloc] init]; tabBar.type = type; return tabBar;} -(instancetype)initWithFrame:(CGRect)frame{ self = [super initWithFrame:frame]; if (self) { self.translucent = NO; UIButton *plusBtn = [UIButton buttonWithType:UIButtonTypeCustom]; self.centerButton = plusBtn; [plusBtn addTarget:self action:@selector(plusBtnDidClick) forControlEvents:UIControlEventTouchUpInside]; [self addSubview:plusBtn];  UILabel *lblTitle = [[UILabel alloc] init]; self.centerTitle = lblTitle; lblTitle.font = [UIFont systemFontOfSize:10]; lblTitle.textColor = [UIColor blackColor]; lblTitle.textAlignment = NSTextAlignmentCenter; [self addSubview:lblTitle];  } return self;} -(void)plusBtnDidClick{ if (self.tabDelegate && [self.tabDelegate respondsToSelector:@selector(tabBar:clickCenterButton:)]) { [self.tabDelegate tabBar:self clickCenterButton:self.centerButton]; }}  // 调整子视图的布局-(void)layoutSubviews{ [super layoutSubviews]; CGFloat width = self.frame.size.width/self.type; Class class = NSClassFromString(@"UITabBarButton"); for (UIView *view in self.subviews) { if ([view isEqual:self.centerTitle]) {//self.centerButton  view.frame = CGRectMake(0, 0, width, 15);  view.center = CGPointMake(self.frame.size.width/2, self.frame.size.height - view.frame.size.height + 8); }else if ([view isEqual:self.centerButton]) {//self.centerButton  view.frame = CGRectMake(0, 0, width, self.frame.size.height);  [view sizeToFit];  view.center = CGPointMake(self.frame.size.width/2, 10); }else if ([view isKindOfClass:class]){//system button  CGRect frame = view.frame;  int indexFromOrign = view.frame.origin.x/width;//防止UIView *view in self.subviews 获取到的不是有序的  if (indexFromOrign >= (self.type - 1) / 2) {  indexFromOrign++;  }  CGFloat x = indexFromOrign * width;  //如果是系统的UITabBarButton，那么就调整子控件位置，空出中间位置  view.frame = CGRectMake(x, view.frame.origin.y, width, frame.size.height);    //调整badge postion  for (UIView *badgeView in view.subviews){  NSString *className = NSStringFromClass([badgeView class]);  // Looking for _UIBadgeView  if ([className rangeOfString:@"BadgeView"].location != NSNotFound){   badgeView.layer.transform = CATransform3DIdentity;   badgeView.layer.transform = CATransform3DMakeTranslation(-17.0, 1.0, 1.0);   break;  }  } } }} -(UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{ //这一个判断是关键，不判断的话push到其他页面，点击发布按钮的位置也是会有反应的，这样就不好了 //self.isHidden == NO 说明当前页面是有tabbar的，那么肯定是在导航控制器的根控制器页面 //在导航控制器根控制器页面，那么我们就需要判断手指点击的位置是否在发布按钮身上 //是的话让发布按钮自己处理点击事件，不是的话让系统去处理点击事件就可以了 if (self.isHidden == NO) { //将当前tabbar的触摸点转换坐标系，转换到发布按钮的身上，生成一个新的点 CGPoint newP = [self convertPoint:point toView:self.centerButton];  //判断如果这个新的点是在发布按钮身上，那么处理点击事件最合适的view就是发布按钮 if ( [self.centerButton pointInside:newP withEvent:event]) {  return self.centerButton; }else{//如果点不在发布按钮身上，直接让系统处理就可以了  return [super hitTest:point withEvent:event]; } } else {//tabbar隐藏了，那么说明已经push到其他的页面了，这个时候还是让系统去判断最合适的view处理就好了 return [super hitTest:point withEvent:event]; }} -(void)setCenterBtnIcon:(NSString *)centerBtnIcon{ _centerBtnIcon = centerBtnIcon; [self.centerButton setBackgroundImage:[UIImage imageNamed:self.centerBtnIcon] forState:UIControlStateNormal]; [self.centerButton setBackgroundImage:[UIImage imageNamed:self.centerBtnIcon] forState:UIControlStateHighlighted];} -(void)setCenterBtnTitle:(NSString *)centerBtnTitle{ _centerBtnTitle = centerBtnTitle; self.centerTitle.text = centerBtnTitle;}  @end

// viewDidLoda中, KVO形式添加[self setValue:self.ylTabBar forKey:@"tabBar"]; - (YLTabBar *)ylTabBar { if (!_ylTabBar) { _ylTabBar = [YLTabBar instanceCustomTabBarWithType:kTbaBarItemUIType_Five]; _ylTabBar.centerBtnIcon = @"centerIcon"; _ylTabBar.tabDelegate = self; } return _ylTabBar;}

-(void)tabBar:(YLTabBar *)tabBar clickCenterButton:(UIButton *)sender{ UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"点击了中间按钮" preferredStyle:UIAlertControllerStyleAlert]; UIAlertAction *action = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {  // TODO }]; [alert addAction:action]; [self presentViewController:alert animated:YES completion:nil];}