perfomSelector on按钮和发送参数 [英] perfomSelector on button and sending parameters

问题描述

我有一个包含多个变量的方法：

I have a method with multiple variables:

-(void) showImg:(UIBarButtonItem *)sender string1:(NSString *) string2:(NSString *);

我想发送 NSString 值（As这个函数用于多个元素）。

I want to send NSString values (As this function is used for multiple elements).

这是我在没有参数时添加动作的方式：

This is how I add my action when no parameters are needed:

[myButton addTarget:self action:@selector(showImg) forControlEvents: UIControlEventTouchUpInside];

我尝试在 @selector 中添加参数像这样：

I tried adding parameters within the @selector like this:

[myButton performSelector @selector(showImg:string1:string2::) withObject:@"-1" withObject:@"-1"];

但这不起作用。如何在 @selector 中直接使用多个参数调用函数？

But this does not work. How may I call my function with multiple parameters directly inside the @selector?

推荐答案

你可以让 UIButton 调用函数在中间（像中间人），控制下一个函数参数。

You can make your UIButton call a function in between (like a middle man), to control the next functions parameters.

UIButton *myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[myButton addTarget:self action:@selector(buttonTapped:) forControlEvents:UIControlEventTouchUpInside];

-(void) buttonTapped:(id)sender{
    if(<some logical condition>){
        [self showImg:sender string1:@"-1" string2:@"-1"];
    }else {
        [self showImg:sender string1:@"otherVal1" string2:@"otherVal2"];
    }
}

-(void) showImg:(id)sender string1:(NSString *)string1 string2:(NSString*)string2 {
    //Other logic
}

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