iOS 6中不推荐使用的代码回退到iOS 5 [英] Deprecated code in iOS 6 fallback to iOS 5

问题描述

我有这个自定义后退按钮：

I have this custom back button:

- (IBAction)backToMenu:(id)sender {

[self.presentingViewController dismissModalViewControllerAnimated:YES]; 

}

在iOS 6模拟器中测试我的应用程序说dismissModalViewControllerAnimated已弃用，我必须使用dismissViewControllerAnimated，所以，我如何使用iOS 6代码并回退到iOS 5

Testing my app in the iOS 6 simulator says dismissModalViewControllerAnimated is deprecated, and I must use dismissViewControllerAnimated instead, so, how I can use the iOS 6 code and fallback to iOS 5

我试过这个：

if([self respondsToSelector:@selector(presentingViewController:animated:completion:)])
    [self.presentingViewController dismissViewControllerAnimated:(YES) completion:nil];
else if([self respondsToSelector:@selector(presentingViewController:animated:)])
    [self.presentingViewController dismissModalViewControllerAnimated:YES];
else
    NSLog(@"Oooops, what system is this ?!!! - should never see this !");

但是没有结果，我看到了NSLog并且没有任何视图被解雇，任何提示？

But without results, I'm seeing the NSLog and no view is dismissed, any hints?

提前谢谢。

推荐答案

您正在测试的选择器与您正在调用的选择器不同。请尝试以下操作：

The selectors you're testing for aren't the same as the selectors you're calling. Try the following:

if([self.presentingViewController respondsToSelector:@selector(dismissViewControllerAnimated:completion:)])
    [self.presentingViewController dismissViewControllerAnimated:(YES) completion:nil];
else if([self.presentingViewController respondsToSelector:@selector(dismissModalViewControllerAnimated:)])
    [self.presentingViewController dismissModalViewControllerAnimated:YES];
else
    NSLog(@"Oooops, what system is this ?!!! - should never see this !");

重要区别在于你正在调用的对象 - self.presentingViewController ，在这种情况下 - 与您在该对象上调用的方法不同。我们将后者称为选择器，这就是你要放在 @selector（）包装器中的位。

The important difference is that the object you're calling - self.presentingViewController, in this case - is different from the method you're calling on that object. We call the latter a selector, and that's the bit you want to put inside the @selector() wrapper.

这篇关于iOS 6中不推荐使用的代码回退到iOS 5的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！