iOS自定义tabBar

在我们的项目中经常会自己自定义tabBar因为苹果自带的真的****太丑了****！也不满足我们的项目需求。

好 开始行动吧！

先上图看下我们最终实现的效果：

继承UItabBar自定义一个自己的tabBar

.h
#import <UIKit/UIKit.h>

@class HJTTabBar;
@protocol ZTTabBarDelegate <UITabBarDelegate>

@optional

- (void)tabBarDidClickPlusButton:(HJTTabBar *)tabBar;

@end

@interface HJTTabBar : UITabBar

@property (nonatomic, weak) id<ZTTabBarDelegate> myDelegate;

@end

.m
#import "HJTTabBar.h"
#import "UIBarButtonItem+Extension.h"
#import "UIView+Extension.h"
@interface HJTTabBar ()

@property (nonatomic, weak) UIButton *plusBtn;

@end

@implementation HJTTabBar

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        UIButton *plusBtn = [[UIButton alloc] init];
        [plusBtn setBackgroundImage:[UIImage imageNamed:@"tabbar_compose_button"] forState:UIControlStateNormal];
        [plusBtn setBackgroundImage:[UIImage imageNamed:@"tabbar_compose_button_highlighted"] forState:UIControlStateHighlighted];
        [plusBtn setImage:[UIImage imageNamed:@"tabbar_compose_icon_add"] forState:UIControlStateNormal];
        [plusBtn setImage:[UIImage imageNamed:@"tabbar_compose_icon_add_highlighted"] forState:UIControlStateHighlighted];

        plusBtn.size = plusBtn.currentBackgroundImage.size;
        [plusBtn addTarget:self action:@selector(plusBtnClick) forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:plusBtn];
        self.plusBtn = plusBtn;
    }
    return self;
}

/**
 *  加号按钮点击
 */
- (void)plusBtnClick
{
    // 通知代理
    if ([self.delegate respondsToSelector:@selector(tabBarDidClickPlusButton:)]) {
        [self.myDelegate tabBarDidClickPlusButton:self];
    }
}

/**
 *  想要重新排布系统控件subview的布局，推荐重写layoutSubviews，在调用父类布局后重新排布。
 */
- (void)layoutSubviews
{
    [super layoutSubviews];
    
    // 1.设置加号按钮的位置
    self.plusBtn.centerX = self.width*0.5;
    self.plusBtn.centerY = self.height*0.5;
    
    // 2.设置其他tabbarButton的frame
    CGFloat tabBarButtonW = self.width / 5;
    CGFloat tabBarButtonIndex = 0;
    for (UIView *child in self.subviews) {
//UITabBarItem  UITabBarButton
        Class class = NSClassFromString(@"UITabBarItem  ");
        if ([child isKindOfClass:class]) {
            // 设置x
            child.x = tabBarButtonIndex * tabBarButtonW;
            // 设置宽度
            child.width = tabBarButtonW;
            // 增加索引
            tabBarButtonIndex++;
            if (tabBarButtonIndex == 2) {
                tabBarButtonIndex++;
            }
        }
    }
}

@end

下面是Category：

UIView+Extension.h中：
#import <UIKit/UIKit.h>

@interface UIView (Extension)

@property (nonatomic, assign) CGFloat x;
@property (nonatomic, assign) CGFloat y;
@property (nonatomic, assign) CGFloat centerX;
@property (nonatomic, assign) CGFloat centerY;
@property (nonatomic, assign) CGFloat width;
@property (nonatomic, assign) CGFloat height;
@property (nonatomic, assign) CGSize size;
@property (nonatomic, assign) CGPoint origin;

@end

UIView+Extension.m中：
#import "UIView+Extension.h"

@implementation UIView (Extension)

- (void)setX:(CGFloat)x
{
    CGRect frame = self.frame;
    frame.origin.x = x;
    self.frame = frame;
}

- (void)setY:(CGFloat)y
{
    CGRect frame = self.frame;
    frame.origin.y = y;
    self.frame = frame;
}

- (CGFloat)x
{
    return self.frame.origin.x;
}

- (CGFloat)y
{
    return self.frame.origin.y;
}

- (void)setCenterX:(CGFloat)centerX
{
    CGPoint center = self.center;
    center.x = centerX;
    self.center = center;
}

- (CGFloat)centerX
{
    return self.center.x;
}

- (void)setCenterY:(CGFloat)centerY
{
    CGPoint center = self.center;
    center.y = centerY;
    self.center = center;
}

- (CGFloat)centerY
{
    return self.center.y;
}

- (void)setWidth:(CGFloat)width
{
    CGRect frame = self.frame;
    frame.size.width = width;
    self.frame = frame;
}

- (void)setHeight:(CGFloat)height
{
    CGRect frame = self.frame;
    frame.size.height = height;
    self.frame = frame;
}

- (CGFloat)height
{
    return self.frame.size.height;
}

- (CGFloat)width
{
    return self.frame.size.width;
}

- (void)setSize:(CGSize)size
{
    CGRect frame = self.frame;
    frame.size = size;
    self.frame = frame;
}

- (CGSize)size
{
    return self.frame.size;
}

- (void)setOrigin:(CGPoint)origin
{
    CGRect frame = self.frame;
    frame.origin = origin;
    self.frame = frame;
}

- (CGPoint)origin
{
    return self.frame.origin;
}

@end

UIBarButtonItem+Extension.h中：

#import <UIKit/UIKit.h>

@interface UIBarButtonItem (Extension)

+ (UIBarButtonItem *)itemWithTargat:(id)target action:(SEL)action image:(NSString *)image highImage:(NSString *)highImage;

@end

UIBarButtonItem+Extension.m中：

#import "UIBarButtonItem+Extension.h"
#import "UIView+Extension.h"
@implementation UIBarButtonItem (Extension)

/**
 *  创建一个item
 *
 *  @param target    点击item后调用哪个对象的方法
 *  @param action    点击item后调用target的哪个方法
 *  @param image     图片
 *  @param highImage 高亮的图片
 *
 *  @return 创建完的item
 */
+ (UIBarButtonItem *)itemWithTargat:(id)target action:(SEL)action image:(NSString *)image highImage:(NSString *)highImage
{
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    // 设置图片
    [btn setBackgroundImage:[UIImage imageNamed:image] forState:UIControlStateNormal];
    [btn setBackgroundImage:[UIImage imageNamed:highImage] forState:UIControlStateHighlighted];
    // 设置尺寸
    btn.size = btn.currentBackgroundImage.size;
    [btn addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
    
    return [[UIBarButtonItem alloc] initWithCustomView:btn];
}

@end

接下来我们就该在需要的地方使用自定义的tabBar了

• 我是在UITabBarController中使用自定义的tabBar。

导入#import "HJTTabBar.h"并遵循 HJTTabBarDelegate协议。

在- (void)viewDidLoad 中实现下面代码：

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 添加子控制器
    [self addChildVc:[[FirstPageViewController alloc] init] title:@"首页" image:@"tabbar_home" selectedImage:@"tabbar_home_selected"];
    [self addChildVc:[[CommunityViewController alloc] init] title:@"社区" image:@"tabbar_message_center" selectedImage:@"tabbar_message_center_selected"];
    [self addChildVc:[[MessageViewController alloc] init] title:@"消息" image:@"tabbar_discover" selectedImage:@"tabbar_discover_selected"];
    [self addChildVc:[[ConsultViewController alloc] init] title:@"咨询" image:@"tabbar_profile" selectedImage:@"tabbar_profile_selected"];
    
    HJTTabBar *tabBar = [[HJTTabBar alloc] init];
    
    //取消tabBar的透明效果
    tabBar.translucent = NO;
    tabBar.myDelegate = self;
    // KVC：如果要修系统的某些属性，但被设为readOnly，就是用KVC，即setValue：forKey：。
    [self setValue:tabBar forKey:@"tabBar"];
      
}

实现下面方法：

- (void)addChildVc:(UIViewController *)childVc title:(NSString *)title image:(NSString *)image selectedImage:(NSString *)selectedImage
{
    // 设置子控制器的文字(可以设置tabBar和navigationBar的文字)
    childVc.title = title;
    
    // 设置子控制器的tabBarItem图片
    childVc.tabBarItem.image = [UIImage imageNamed:image];
    // 禁用图片渲染
    childVc.tabBarItem.selectedImage = [[UIImage imageNamed:selectedImage] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    
    // 设置文字的样式
    [childVc.tabBarItem setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor blackColor]} forState:UIControlStateNormal];
    [childVc.tabBarItem setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor redColor]} forState:UIControlStateSelected];
    //    childVc.view.backgroundColor = RandomColor; // 这句代码会自动加载主页，消息，发现，我四个控制器的view，但是view要在我们用的时候去提前加载
    
    // 为子控制器包装导航控制器
    UINavigationController *navigationVc = [[UINavigationController alloc] initWithRootViewController:childVc];
    // 添加子控制器
    [self addChildViewController:navigationVc];
}

#pragma HJTTabBarDelegate
/**
 *  加号按钮点击
 */
- (void)tabBarDidClickPlusButton:(HJTTabBar *)tabBar
{
    NSLog(@"+++");
}

好了 完事！