iphone - 保存在 UIPicker 中选择的值的最佳方法？

Question

我的视图中有 3 个 UIPicker，我想在我的应用关闭时保存选定的值。我目前将 NSUserDefaults 用于其他所有内容。但我不确定保存 UIPickers 选定值的语法。感谢我的码友们！

Answer 1

这是从 UIPickerView 获取选定值的方法 -

[yourPickerDataArray objectAtIndex:[pickerView selectedRowInComponent:0]];

以下是如何在 NSUserDefaults 中保存值 -

NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];

// saving an NSString
[prefs setObject:@"TextToSave" forKey:@"keyToLookupString"];

// saving an NSInteger
[prefs setInteger:42 forKey:@"integerKey"];

// saving a Double
[prefs setDouble:3.1415 forKey:@"doubleKey"];

// saving a Float
[prefs setFloat:1.2345678 forKey:@"floatKey"];

// This is suggested to synch prefs, but is not needed (I didn't put it in my tut)
[prefs synchronize];

以下是如何从 NSUserDefaults 检索值 -

NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];

// getting an NSString
NSString *myString = [prefs stringForKey:@"keyToLookupString"];

// getting an NSInteger
NSInteger myInt = [prefs integerForKey:@"integerKey"];

// getting an Float
float myFloat = [prefs floatForKey:@"floatKey"];