导航栏右上角按钮

UIButton *completeButton = [UIButton buttonWithType:UIButtonTypeCustom];
completeButton.frame = CGRectMake(0, 0, 35, 35);
[completeButton setTitleColor:colorWithMainColor forState:UIControlStateNormal];
[completeButton setTitle:@"完成" forState:UIControlStateNormal];
completeButton.titleLabel.font = [UIFont systemFontOfSize:15.0];
[completeButton addTarget:self action:@selector(completeButtonClick:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *rightItem = [[UIBarButtonItem alloc]initWithCustomView:completeButton];
self.navigationItem.rightBarButtonItem = rightItem;