Question

在我的应用程序中，我让用户选择背景，色调和文字的颜色。应用关闭后如何保存此设置？我的意思是当用户再次启动应用程序时，他希望看到之前使用的背景，色调和文本颜色。

这就是我设置颜色的方式。

self.BackgroundView.backgroundColor = [UIColor colorWithRed:248.0/255.0 green:242.0/255.0 blue:229.0/255.0 alpha:1.0];

[[[self navigationController] navigationBar] setTintColor:[UIColor colorWithRed:103.0/255.0 green:10.0/255.0 blue:10.0/255.0 alpha:1.0]];

self.QuoteText.textColor = [UIColor colorWithRed:131.0/255.0 green:21.0/255.0 blue:21.0/255.0 alpha:1.0];

尝试通过遵循Greg（可能是正确的）答案来解决，通过单击以下按钮给出SIGABRT错误：

- (IBAction)setcolor:(id)sender {

    UIColor *backgroundColor = [UIColor colorWithRed:230.0/255.0 green:230.0/255.0 blue:220.0/255.0 alpha:1.0];
    self.BackgroundView.backgroundColor = backgroundColor;

    UIColor *tintColor = [UIColor colorWithRed:129.0/255.0 green:165.0/255.0 blue:148.0/255.0 alpha:1.0];
    [[[self navigationController] navigationBar] setTintColor:tintColor];

    UIColor *textColor = [UIColor colorWithRed:0.0/255.0 green:98.0/255.0 blue:139.0/255.0 alpha:1.0];
    self.QuoteText.textColor = textColor;

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setObject:backgroundColor forKey:@"BACKGCOLOR"];
    [defaults setObject:tintColor forKey:@"TINTCOLOR"];
    [defaults setObject:textColor forKey:@"TEXTCOLOR"];
    [defaults synchronize];

}

Answer 1

如果用户选择颜色而不是

self.BackgroundView.backgroundColor = [UIColor colorWithRed:248.0/255.0 green:242.0/255.0 blue:229.0/255.0 alpha:1.0];

你可以做到

    UIColor *backgroundColor = [UIColor colorWithRed:248.0/255.0 green:242.0/255.0 blue:229.0/255.0 alpha:1.0];
    self.BackgroundView.backgroundColor = backgroundColor;
    NSData *backgroundColorData = [NSKeyedArchiver archivedDataWithRootObject:backgroundColor];

    UIColor *tintColor = [UIColor colorWithRed:103.0/255.0 green:10.0/255.0 blue:10.0/255.0 alpha:1.0];
    [[[self navigationController] navigationBar] setTintColor:tintColor];
    NSData *tintColorData = [NSKeyedArchiver archivedDataWithRootObject: tintColor];

    UIColor *textColor = [UIColor colorWithRed:131.0/255.0 green:21.0/255.0 blue:21.0/255.0 alpha:1.0];
    self.QuoteText.textColor = textColor;
    NSData *textColorData = [NSKeyedArchiver archivedDataWithRootObject: textColor];

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setObject: backgroundColorData forKey:@"BACKGCOLOR"];
    [defaults setObject:tintColorData forKey:@"TINTCOLOR"];
    [defaults setObject:textColorData forKey:@"TEXTCOLOR"];
    [defaults synchronize];

您对色调和文字颜色也是如此（只需使用不同的键）。

在视图控制器中，您要在viewDidLoad中更改视图颜色：

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSData *backgColorData = [defaults objectForKey:@"BACKGCOLOR"];
UIColor *backgColor = [NSKeyedUnarchiver unarchiveObjectWithData:backgColorData];
NSData *tintColorData = [defaults objectForKey:@"TINTCOLOR"];
UIColor *tintColor = [NSKeyedUnarchiver unarchiveObjectWithData:tintColorData];
NSData *textColorData = [defaults objectForKey:@"TEXTCOLOR"];
UIColor *textColor = [NSKeyedUnarchiver unarchiveObjectWithData: textColorData];
if (backgColor)
    self.BackgroundView.backgroundColor = backgColor;
if (tintColor)
    [[[self navigationController] navigationBar] setTintColor:tintColor];
if (textColor)
    self.QuoteText.textColor = textColor;

Answer 2

Apple正在为此提供NSUserDefaults，它的行为与您的用户/应用程序的首选项相似。取自here

的示例

保存：

NSString *valueToSave = @"someValue";
[[NSUserDefaults standardUserDefaults]
    setObject:valueToSave forKey:@"preferenceName"];

稍后再回来：

NSString *savedValue = [[NSUserDefaults standardUserDefaults]
    stringForKey:@"preferenceName"];

Answer 3

使用nsuserdefaults进行测试以保存设置或写入plist。

在iPhone / iPad应用程序中保存用户设置

3 个答案: