//点击空白处事件
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(keyboardHide:)];
//设置成NO表示当前控件响应后会传播到其他控件上,默认为YES。
tapGestureRecognizer.cancelsTouchesInView = NO;
//将触摸事件添加到当前view
[self.view addGestureRecognizer:tapGestureRecognizer];
//点击空白处隐藏键盘
-(void)keyboardHide:(UITapGestureRecognizer*)tap{
[谁发起的键盘写谁 resignFirstResponder];
}
a到b b到c c返回直接到a 页面
// 获取所有的控制器数组
NSMutableArray *vcArr = [NSMutableArray arrayWithArray:self.navigationController.viewControllers];
// 将上级页面从数组中移除
[vcArr removeObjectAtIndex:vcArr.count-2];
self.navigationController.viewControllers = vcArr;
[self.navigationController popViewControllerAnimated:YES];
[SVProgressHUD dismiss];