Question

点击UIToolbar上的UIBarButtonItem如何检测是点击哪一个

Answer 1

我自己用xcode模板生成一个程序，然后把root view controller添加以下代码，发现应该可以用tag来区分啊？selector函数中传入的sender是一个UIBarButtonItem.

我用的是viewcontroller自带的toolbar。不过道理应该一样吧。

- (void)viewDidLoad {
[super viewDidLoad];

UIBarButtonItem* b1 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(onToolbarButtonTapped:)];
b1.tag = 2010;

UIBarButtonItem* b2 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(onToolbarButtonTapped:)];
b2.tag = 2011;

self.navigationController.toolbarHidden = FALSE;
NSArray* buttons = [NSArray arrayWithObjects:
b1,
b2,
NULL];
self.toolbarItems = buttons;
[b1 release];
[b2 release];
}

- (void) onToolbarButtonTapped:(id)sender {
NSLog(@"sender: %@, tag = %d", sender, [sender tag]);
switch([sender tag]) {
case 2010:
NSLog(@"add button");
break;
case 2011:
NSLog(@"action button");
break;
default:
NSLog(@"unknown button");
}
}

运行时，先点一下第一个按纽，再点一下第二个，输出为：

2010-07-21 15:36:35.587 [20852:207] sender: <UIBarButtonItem: 0x5957040>, tag = 2010
2010-07-21 15:36:35.589 [20852:207] add button
2010-07-21 15:36:36.041 [20852:207] sender: <UIBarButtonItem: 0x5953bb0>, tag = 2011
2010-07-21 15:36:36.043 [20852:207] action button