在定制UITabBar时要继承与UITabBarController
- (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
//1.获取subView
NSArray *subView = self.tabBar.subviews;
//2.遍历出subView上所有的
for (UIView *view in subView) {
NSLog(@"%@",view);
}
//3.UITabBarButton 字符串转换成类
Class tabBarButton = NSClassFromString(@"UITabBarButton");
//4.遍历类，如果是按钮 就移除
for (UIView *item in subView) {
//判断subViews上的控件是否属于 UITabBarButton类 如果属于将其移除，否则继续循环
if ([item isKindOfClass:tabBarButton]) {
[item removeFromSuperview];
}
}
//创建存放tabBar上控件的子视图
UIView *view = [[UIView alloc]initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, self.tabBar.frame.size.height)];
view.backgroundColor = [UIColor purpleColor];
[self.tabBar addSubview:view];
int r = 3;
CGFloat padding = (self.tabBar.bounds.size.width - 50 *r) / (r+1);
for (int i = 0; i < r; i++) {
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(padding*(i+1)+50*i, 0, 50, self.tabBar.frame.size.height);
button.backgroundColor = [UIColor orangeColor];
button.tag = i+100;
//点击事件
[button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
[view addSubview:button];
}
}
//通过tag值找到对应的界面
- (void)buttonAction:(UIButton *)btn{
self.selectedIndex = btn.tag - 100;
}