如何以编程方式为UIButton设置Call​​Back？

本文介绍了如何以编程方式为UIButton设置Call​​Back？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

手动构建：

[btnRun addTarget:self action:@selector(RunApp:) forControlEvents:UIControlEventTouchUpOutside];

程序化构建：

Programmatically built: something of the following like ??

- (void) setRunButton:(UIButton*)objectName mySelector:(NSString*)funcName myControlEvent:(NSString*) controlEvent { [objectName addTarget:self action:@selector(funcName) forControlEvents:controlEvent]; }

推荐答案

像下面这样：

- (void)setRunButton:(UIButton *)objectName mySelector:(NSString *)action myControlEvent:(UIControlEvents)controlEvent { [objectName addTarget:self action:NSSelectorFromString(action) forControlEvents:controlEvent]; }

将选择器作为 NSString ，但您可以使用 NSSelectorFromString（）将选择器的字符串名称转换为选择器。

It is unusual to pass a selector as an NSString but you can use NSSelectorFromString() to convert the string name of the selector into a selector.

控制事件参数不是它们是枚举的字符串，所以我改变了 myControlEvent 参数， c $ c> UIControlEvents 类型。

Control events parameters are not strings they are an enumeration so I have changed the myControlEvent parameter to have the UIControlEvents type.

这将是更通常的选择器传递到方法使用 @selector （action）。但是， @selector 在编译时处理，因此参数实际上不是 NSString 。在这种情况下，方法看起来像：

It would be more usual to pass the selector to the method using @selector(action). However, @selector is handled at compile time so the parameter isn't actually an NSString. In this case the method would look like:

- (void)setRunButton:(UIButton *)objectName mySelector:(SEL)action myControlEvent:(UIControlEvents)controlEvent { [objectName addTarget:self action:action forControlEvents:controlEvent]; }