保存并加载UISwitch状态 [英] Save and Load UISwitch state

问题描述

我想保存swtich状态并在程序重启时加载它。

I want to save the swtich state and load it when the program restarted.

[[NSUserDefaults standardUserDefaults] setBool:switchControl.on forKey:@"switch"];
[[NSUserDefaults standardUserDefaults] synchronize];

这是保存部分

BOOL test= [[NSUserDefaults standardUserDefaults] boolForKey:@"switch"];
NSLog(@"%@",test?@"YES":@"NO");
if(test == YES)
    [switchControl setOn:YES animated:YES];
else
     [switchControl setOn:NO animated:YES];

这是需要设置切换到其值的部分。我在viewdidload中执行了此操作方法，因为当我关闭应用程序并重新启动它时，我希望开关的状态设置保存的部分。

This is the part that is need to be set the switch to its value.I did this in viewdidload method because when i close the application and restarted it i want the state of the switch set the saved part .

但是它仍然显示默认部分可以帮助我设置它？

But it is still showing the default part can u help me to set it?

推荐答案

您是否将交换机创建为具有属性的IBOutlet？如果是这样，我认为您的问题是您不要将 switchControl 称为 self.switchControl 。

Did you create the switch as an IBOutlet with properties? If so, I think your problem is that you dont refer to your switchControl as self.switchControl.

然后您的正确保存声明将变为

Then your correct saving statement will become

[[NSUserDefaults standardUserDefaults] setBool:self.switchControl.on forKey:@"switch"];
[[NSUserDefaults standardUserDefaults] synchronize];

我会将设置开关的部分移动到 viewWillAppear 并且这样做：

I'd move the part that sets the switch into viewWillAppear and do it like this:

- (void)viewWillAppear:(BOOL)animated
{
  [super viewWillAppear:animated];
  BOOL test= [[NSUserDefaults standardUserDefaults] boolForKey:@"switch"];
  NSLog(@"%@",test?@"YES":@"NO");
  [self.switchControl setOn:test animated:YES];
}

我也为你取了一个不必要的if语句。

I took out an unnecessary if-statement for you, too.

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