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UIButton *titleBtn = [[UIButton alloc]initWithFrame:CGRectMake(110,0,100,44)];
[titleBtn setTitle:@"切换城市" forState:0];
[titleBtn addTarget:self action:@selector(goSelectCity) forControlEvents:UIControlEventTouchUpInside];
self.navigationItem.titleView = titleBtn;
[titleBtn release];
-(void)goSelectCity
{
//你要干的事
[self dismissModalViewControllerAnimated:YES];
}