传递类型为UITextDelegate的ViewController作为参数

Question

我在Util.m中有一个静态函数

+ (UIView *) getBackButtonAsSubViewForNavigationBar:(UIViewController *)targetView :(SEL)targetAction {

       ...
       [button addTarget:targetView action:targetAction ...];

}

在MyViewController : UIViewController < UITextFieldDelegate >内，我尝试将其用作

UIView * backBtn = [Util getBackButtonAsSubViewForNavigationBar:self targetAction:@selector(cancelOp)]

但是Xcode说：

  

没有知道选择器方法的类   'getBackButtonAsSubViewForNavigationBar：targetAction：

我错过了什么？

Util.h


+ (UIView *) getBackButtonAsSubViewForNavigationBar:(UIViewController *)targetView :(SEL)targetAction;


Util.m

+ (UIView *) getBackButtonAsSubViewForNavigationBar:(UIViewController *)targetView :(SEL)targetAction {

       ...
       [button addTarget:targetView action:targetAction ...];

}

cancelOp如下：

- (IBAction)cancelOp:(id)sender {
    [self dismissViewControllerAnimated:YES completion:Nil];
}

Answer 1

您应该将/ define方法声明为：

Util.h


+ (UIView *) getBackButtonAsSubViewForNavigationBar:(UIViewController *)targetView target:(SEL)targetAction;


Util.m

+ (UIView *) getBackButtonAsSubViewForNavigationBar:(UIViewController *)targetView target:(SEL)targetAction {

       ...
       [button addTarget:targetView action:targetAction ...];

}