两个View 使用BLOCK传值

来源：互联网发布：java string类split 编辑：程序博客网时间：2024/05/17 09:10

从DetailView向MasterView传递一个NSString*

DetailView声明一个block属性:

@property (nonatomic, copy) void(^doTransferMsg)(NSString *_msg);

然后在DetailView的传值方法里检查block是否存在，并传入NSString*:

- (IBAction)transferText:(UIButton *)sender {  if (_doTransferMsg) {    _doTransferMsg(@"hello there");    _doTransferMsg = nil;  }  [self.navigationController popViewControllerAnimated:YES];}

在MasterView里，创建DetailView的时候，调用并实现这个block：

- (IBAction)LoadDetailView:(UIButton *)sender {  [ibTextLabel setText:nil];  DetailViewController *_curDetail = [[DetailViewController alloc] initWithNibName:@"DetailViewController"                                                                            bundle:nil];  [_curDetail setDoTransferMsg:^(NSString *_msg) {    dispatch_async(dispatch_get_main_queue(), ^{      [ibTextLabel setText:_msg];    });  }];  [self.navigationController pushViewController:_curDetail                                       animated:YES];  [_curDetail release];}

原文链接：http://tigerandy.blog.163.com/blog/static/976385201301244756793/

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