凸出按钮的TabBar

- (void)addCenterBtn{

UIImage * image = [UIImage imageNamed:@"money"];

UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom];

[btn setImage:image forState:UIControlStateNormal];

btn.frame = CGRectMake(0, 0, image.size.width, image.size.height);

[btn addTarget:self action:@selector(centerClicked) forControlEvents:UIControlEventTouchUpInside];

//设置凸出按钮的位置

CGPoint center = self.tabBar.center;

center.y -= 15;

btn.center = center;

//去掉点击按钮时的阴影

btn.adjustsImageWhenHighlighted = NO;

[self.view addSubview:btn];

}

- (void)centerClicked{

self.selectedIndex = 1;

}