用NSUserDefaults存储Color

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http://www.cocoachina.com/bbs/read.php?tid=152936

UIColor *textDefaultColor = [UIColor blackColor];    CGColorRef textDefaultColorRef = textDefaultColor.CGColor;    NSString *textDefaultColorStr = [CIColor colorWithCGColor:textDefaultColorRef].stringRepresentation;     NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];    [userDefaults setObject:textDefaultColorStr forKey:@"textColorKey"];