objective-c - 如何获取UIBarButtonItem的目标

Question

我在UIViewController子类中有以下代码:

MyViewController *viewController = [[MyViewController alloc] init];
viewController.title = title;

UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"image"]
                                                               style:UIBarButtonItemStyleDone
                                                              target:self 
                                                              action:@selector(mySelector)]; 
viewController.navigationItem.leftBarButtonItem = doneButton;


 NSLog(@"Class name:%@",[viewController.navigationItem.leftBarButtonItem.target className]);

代码在NSLog语句上崩溃，并且警告说找不到className方法。目标属性不是对象，因此我应该可以在其上调用className？

我最终实际上想做的是从viewController调用mySelector而不按下按钮。有什么好方法吗？

Answer 1

要直接执行选择器，请尝试调用performSelector:

    [[doneButton target] performSelector:[doneButton action]];