可能重复:
Uibutton 事件
-(void)myButtonclick {
NSString *data=[[NSString alloc]initWithString:@"YES U PRESSED BUTTON"];
UIButton *refreshbutton=[UIButton buttonWithType:UIButtonTypeCustom];
[refreshbutton setFrame:CGRectMake(15.0f, 330.0f, 150.0f, 32.0f)];
[refreshbutton setCenter:CGPointMake(80.0f,340)];
[refreshbutton setBackgroundImage: normalImage forState: UIControlStateNormal];
[refreshbutton setBackgroundImage: downImage forState: UIControlStateHighlighted];
[refreshbutton setBackgroundImage: selectedImage forState: UIControlStateSelected];
[refreshbutton setTitle:@"Refresh" forState:UIControlStateNormal];
[refreshbutton addTarget:self action:@selector(showMessage:) forControlEvents:UIControlEventTouchUpInside];
}
-(id)showMessage:(id)sender{
// Here I want to get the value of "data" which is defined the method
// "myButtonclick" in the first line. how it is possible..?
}
在方法“myButtonclick”的上述代码中,我设置了一个 NSString 变量名称为“data”,当我按下该按钮时,我想在方法“showMessage”中获取(打印)它的值(YES U PRESSED BUTTON)。
我知道这是使用@selector 变量完成的。但我不知道它是如何完成的