如何存儲和NSUserDefaults的中

Question

店加載的backgroundColor -

-(IBAction) setMyColor:(id)sender{ 

if (sender == yellowButton) { 
    [colorView setBackgroundColor:[UIColor yellowColor]]; 
} 

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; 
UIColor *strColor = [colorView backgroundColor]; 
[userDefaults setObject:strColor forKey:@"myColor"]; 
[userDefaults synchronize]; 

}

負載 -

- (void)viewDidLoad { 

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; 
[colorView setBackgroundColor[UIColor [userDefaults objectForKey:@"myColor"]]]; 

[super viewDidLoad]; 

}

，但它無法運行...... 也許問題是'如何從UIView獲取backgroundColor值'？

Answer 1

可以使用

//save  
    NSData *colorData = [NSKeyedArchiver archivedDataWithRootObject:color]; 
    [[NSUserDefaults standardUserDefaults] setObject:colorData forKey:@"myColor"]; 

//retrieve 
    NSData *colorData = [[NSUserDefaults standardUserDefaults] objectForKey:@"myColor"]; 
    UIColor *color = [NSKeyedUnarchiver unarchiveObjectWithData:colorData]; 

or 

//save 
const CGFloat *components = CGColorGetComponents(pColor.CGColor); 
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults]; 
[prefs setFloat:components[0] forKey:@"cr"]; 
[prefs setFloat:components[1] forKey:@"cg"]; 
[prefs setFloat:components[2] forKey:@"cb"]; 
[prefs setFloat:components[3] forKey:@"ca"]; 

//retrieve 
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults]; 
UIColor* tColor = [UIColor colorWithRed:[prefs floatForKey:@"cr"] green:[prefs floatForKey:@"cg"] blue:[prefs floatForKey:@"cb"] alpha:[prefs floatForKey:@"ca"]];