tabBar自定义

有时系统的tabBar并不能满足我们的开发需求：

这时，我们需要自定义一个tabBar。直接上代码：

 // 在tabBarController中用KVC更换掉系统tabBar

    [self setValue:[[TTTabBar alloc] init] forKeyPath:@"tabBar"];

自定义tabBar:

@interface TTTabBar()

/** 相机按钮 */

@property (nonatomic, weak) UIButton *cameraButton;

@end

@implementation XMGTabBar

- (instancetype)initWithFrame:(CGRect)frame

{

    if (self = [super initWithFrame:frame]) {// 添加相机按钮

        UIButton *cameraButton = [UIButton buttonWithType:UIButtonTypeCustom];

        [cameraButton setBackgroundImage:[UIImage imageNamed:@"camera"] forState:UIControlStateNormal];

        [cameraButton setBackgroundImage:[UIImage imageNamed:@"camera_click"] forState:UIControlStateHighlighted];

        cameraButton.size = publishButton.currentBackgroundImage.size;

        [self addSubview:cameraButton];

        self.cameraButton = cameraButton;

    }

    return self;

}

- (void)layoutSubviews

{

    [super layoutSubviews];

    self.cameraButton.center = CGPointMake(self.width * 0.5, self.height * 0.5);

    // 设置UITabBarButton的frame

    CGFloat buttonY = ;

    CGFloat buttonW = self.width / ;

    CGFloat buttonH = self.height;

    NSInteger index = ;

    for (UIView *button in self.subviews) {

        if (![button isKindOfClass:[UIControl class]] || button == self.cameraButton) continue;

        // 计算按钮的x值

        CGFloat buttonX = buttonW * ((index > )?(index + ):index);

        button.frame = CGRectMake(buttonX, buttonY, buttonW, buttonH);

        // 增加索引

        index++;

    }

}