可以将 UIFont 对象保存到 NSUserDefaults答案

【问题标题】：Can an UIFont Object saved to NSUserDefaults可以将 UIFont 对象保存到 NSUserDefaults
【发布时间】：2012-04-19 07:28:42
【问题描述】：

我正在尝试允许 iPhone 应用程序用户通过设置自定义字体来个性化应用程序。我想知道是否可以将 UIFont 对象保存到 NSUserDefaults。设置字体和字体大小然后保存对象会使事情变得容易得多。代码示例也会很棒。

【问题讨论】：

标签： iphone xcode nsuserdefaults uifont

【解决方案1】：

我会创建一个类别来隐藏复杂性 - 你可以从这样的开始

// NSUserDefaults+CustomFontAdditions.h

@interface NSUserDefaults (CustomFontAdditions)

- (UIFont *)ps_fontForKey:(NSString *)fontKey;
- (void)ps_setFont:(UIFont *)font forKey:(NSString *)fontKey;

@end

// NSUserDefaults+CustomFontAdditions.m

#import "NSUserDefaults+CustomFontAdditions.h"

NSString * const PSCustomFontsKey        = @"PSCustomFontsKey";
NSString * const PSCustomFontKeyFontName = @"PSCustomFontKeyFontName";
NSString * const PSCustomFontKeyFontSize = @"PSCustomFontKeyFontSize";

@implementation NSUserDefaults (CustomFontAdditions)

- (UIFont *)ps_fontForKey:(NSString *)fontKey;
{
    NSDictionary *fonts = [self dictionaryForKey:PSCustomFontsKey];

    UIFont *font = nil;

    if (fonts) {
        NSDictionary *fontComponents = [fonts valueForKey:fontKey];

        NSString *fontName = [fontComponents valueForKey:PSCustomFontKeyFontName];
        CGFloat   size     = [[fontComponents valueForKey:PSCustomFontKeyFontSize] floatValue];

        font = [UIFont fontWithName:fontName size:size];
    }

    return font;
}

- (void)ps_setFont:(UIFont *)font forKey:(NSString *)fontKey;
{
    NSMutableDictionary *fonts = [[self dictionaryForKey:PSCustomFontsKey] mutableCopy];

    if (!fonts) {
        fonts = [[NSMutableDictionary alloc] initWithCapacity:1];
    }

    NSDictionary *fontComponents = [[NSDictionary alloc] initWithObjectsAndKeys:
                                    font.fontName, PSCustomFontKeyFontName,
                                    [NSNumber numberWithFloat:font.pointSize], PSCustomFontKeyFontSize, nil];

    [fonts setValue:fontComponents forKey:fontKey];

    [self setObject:fonts forKey:PSCustomFontsKey];
}

@end

用法看起来像

NSUserDefaults *standardUserDefaults = [NSUserDefaults standardUserDefaults];
[standardUserDefaults ps_setFont:[UIFont systemFontOfSize:12.0f] forKey:@"font1"];
[standardUserDefaults ps_setFont:[UIFont fontWithName:@"Helvetica Neue" size:24.0f] forKey:@"font2"];
[standardUserDefaults synchronize];

NSLog(@"%@", [standardUserDefaults ps_fontForKey:@"font1"]);
NSLog(@"%@", [standardUserDefaults ps_fontForKey:@"font2"]);

输出：

#=> 2012-04-19 00:01:21.756 ma[1340:f803] <UICFFont: 0x68a18b0> font-family: "Helvetica"; font-weight: normal; font-style: normal; font-size: 12px
#=> 2012-04-19 00:01:21.765 ma[1340:f803] <UICFFont: 0x6b99670> font-family: "Helvetica Neue"; font-weight: normal; font-style: normal; font-size: 24px

【讨论】：

谢谢保罗...我实施了您的解决方案，它就像一个魅力。欣赏详细的代码示例

【解决方案2】：

这些是可以存储在 NSUserDefaults 中的项目：

NSData、NSString、NSNumber、NSDate、NSArray 或 NSDictionary

你可以这样做：

NSDictionary *fontInformation = [NSDictionary dictionaryWithObjectsAndKeys:
@"YOUR_FONTS_NAME", "fontName",
[NSNumber numberWithInt:14], @"fontSize", nil];

[[NSUserDefaults standardUserDefaults] setObject:fontInformation forKey:@"fontInfo"];

然后你可以从 NSUserDefaults 中获取 NSDictionary 并重新创建 UIFont。

【讨论】：