objective-c - 在右栏按钮项的选择器中传递参数

Question

我有这个代码:

UIBarButtonItem *donebutton = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(doneButtonPressed:)];
    self.navigationItem.rightBarButtonItem = donebutton;

现在我想将一些参数传递给该方法:

- (void)doneButtonPressed{}

怎么做？

Answer 1

如果你想传递对象说字符串然后使用setAssociatedObject:

首先添加

#import <objc/runtime.h>

现在

NSString *strText = @"text";

 objc_setAssociatedObject(donebutton, "Argument", strText, OBJC_ASSOCIATION_RETAIN_NONATOMIC); // provide button , key , object for passing

然后在你需要参数的地方像这样检索:

NSString *str = objc_getAssociatedObject(donebutton, "Argument"); //using button and key
//remove object associated for button if not needed.

但是如果你想要按钮引用那么

- (void)doneButtonPressed:(id)sender{
  UIButton *btnClicked = (UIButton *)sender;
  .......
}