为什么选择tabbarController索引编程不会调用委托方法 [英] why does selecting a tabbarController index programatically doesnt call delegate method

问题描述

当我们触摸tabbarcontroller的tabbaritem时，调用委托方法：

when we touch the tabbaritem of the tabbarcontroller the delegate methods are called:

-(BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController;
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController;

但是当尝试以编程方式执行相同的操作时，即

but when try to do the same thing programmatically, i.e.

[self.tabbarController setSelectedIndex:selectedIndexNo];

或

[self.tabBarController setSelectedViewController:[self.tabBarController.viewControllers objectAtIndex:0]];

这是什么原因？

推荐答案

覆盖UITabBarController setSelectedIndex：

override UITabBarController setSelectedIndex:

-(void)setSelectedIndex:(NSUInteger)selectedIndex
{
    //must call super function. 
    [super setSelectedIndex:selectedIndex];

    [self myMethod];
}

- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
    [self myMethod];
}

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