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用block实现两个页面间的传值
第二个view声明一个block属性:
@property (nonatomic, copy) void(^doTransferMsg)(NSString *_msg);
然后传值方法里检查block是不是存在
- (IBAction)transferText:(UIButton *)sender {
if (_doTransferMsg) {
_doTransferMsg(@"hello there");
_doTransferMsg = nil;
}
[self.navigationController popViewControllerAnimated:YES];
}
if (_doTransferMsg) {
_doTransferMsg(@"hello there");
_doTransferMsg = nil;
}
[self.navigationController popViewControllerAnimated:YES];
}
主View里，创建第二个view的时候，顺便实现这个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];
}
[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];
}
that’s all
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