ios - 如何在 NSUserDefaults 中存储和加载 backgroundColor

Question

商店 -

-(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];

加载-

- (void)viewDidLoad {   

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

[super viewDidLoad];

但是运行失败...也许问题是“如何从 UIView 获取背景颜色值”？

Answer 1

你可以使用

//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"]];