xcode 如何使用在 NSUserDefaults 中保存值的开关来显示/隐藏按钮
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How to show/hide button with switch that saves value in NSUserDefaults
提问by Pavel Kaljunen
I have UISwitchnamed sosSwitchthas saves value in NSUserDefaultskey: MySwitchand I have UIButtonnamed sosBtn. How can I show/hide sosBtndepending on the switch value that was saved in NSUserDefaults? And where I need to put the code? In viewDidLoad? Thank you!
我有一个名为sosSwitch 的UISwitch将值保存在NSUserDefaults键中：MySwitch和我有名为sosBtn 的UIButton。我怎么能显示/隐藏sosBtn取决于保存在开关值NSUserDefaults的？我需要把代码放在哪里？在viewDidLoad？谢谢！
回答by user523234
Assuming that you already have:
假设您已经拥有：
@property (retain, nonatomic) IBOutlet UIButton *sosBtn;
@property (retain, nonatomic) IBOutlet UISwitch *sosSwich;
- (IBAction)sosSwitch:(id)sender;
Try this:
尝试这个：
-(void)viewDidLoad
{
if ([[NSUserDefaults standardUserDefaults] boolForKey:@"MySwitch"])
{
self.sosBtn.hidden = NO;
[self.sosSwich setOn:YES animated:YES];
}
else
{
self.sosBtn.hidden = YES;
[self.sosSwich setOn:NO animated:YES];
}
}
- (IBAction)sosSwitch:(id)sender
{
UISwitch *mySosSwitch = (UISwitch *)sender;
if (mySosSwitch.on)
{
self.sosBtn.hidden = NO;
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"MySwitch"]; //YES means sosBtn should be visible
[[NSUserDefaults standardUserDefaults] synchronize];
}
else
{
self.sosBtn.hidden = YES;
[[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"MySwitch"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
}
