使用NSUserDefaults

Question

我尝试使用此代码在objective-c中保存用户从Plain Segmented Control中选择颜色的内容，但它无法正常工作

用于保存

   UIColor *saveColor = changeColor.backgroundColor;
   NSUserDefaults *Color = [NSUserDefaults standardUserDefaults];
   [Color setObject:saveColor forKey:@"saveColor"];
   [Color synchronize];

用于加载

   NSUserDefaults *color = [NSUserDefaults standardUserDefaults];
   UIColor *loadColor = [color objectForKey:@"saveColor"];
   [changeColor setBackgroundColor:loadColor];

Answer 1

感谢我的工作，我用它来保存

smith_welding_000000.jpg 
 smith_welding_000001.jpg 
 smith_welding_000002.jpg

这将加载

    UIColor *color = self.view.backgroundColor ;
    const CGFloat *components = CGColorGetComponents(color.CGColor);
    NSString *colorAsString = [NSString stringWithFormat:@"%f,%f,%f,%f", components[0], components[1], components[2], components[3]];
    NSUserDefaults *userDefaults =[NSUserDefaults standardUserDefaults];
    [userDefaults setObject:colorAsString forKey:@"color"];

Answer 2

  

您不能直接将UIColor保存到NSUserDfaults。它们必须是NSData，NSString，NSNumber，NSDate，NSArray或NSDictionary的实例，对于可以通过归档放入nsdata的其他和自定义对象。

//For Encoding

UIColor *bgColor =[UIColor whiteColor];
NSData *encodedData =[NSKeyedArchiver archivedDataWithRootObject: bgColor];
[[NSUserDefaults standardUserDefaults] setObject:encodedData forKey:@"bgColorKey"];

//For decoding

NSData *decodedData = [[NSUserDefaults standardUserDefaults] objectForKey:@"bgColorKey"];
UIColor *bgcolor = [NSKeyedUnarchiver unarchiveObjectWithData:decodedData];
self.yourView.backgroundColor = bgcolor;