mirror of
https://github.com/zhigang1992/GVUserDefaults.git
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81 lines
3.5 KiB
Markdown
81 lines
3.5 KiB
Markdown
# GVUserDefaults - NSUserDefaults access via properties
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Tired of writing all that code to get and set defaults in NSUserDefaults? Want to have code completion and compiler checks by using properties instead?
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## Usage
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Create a category on `GVUserDefaults`, add some properties in the .h file and make them `@dynamic` in the .m file.
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// .h
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@interface GVUserDefaults (Properties)
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@property (nonatomic, weak) NSString *userName;
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@property (nonatomic, weak) NSNumber *userId;
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@end
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// .m
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@implementation GVUserDefaults (Properties)
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@dynamic userName;
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@dynamic userId;
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@end
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Now, instead of using `[[NSUserDefaults standardUserDefaults] objectForKey:@"userName"]`, you can simply use `[GVUserDefaults standardUserDefaults].userName`.
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You can even save defaults by setting the property:
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[GVUserDefaults standardUserDefaults].userName = @"myusername";
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### Objects only
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At this moment only objects can be stored, so no integers or booleans. Just wrap them in an NSNumber.
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### Key prefix
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The keys in NSUserDefaults are the same name as your properties. If you'd like to prefix or alter them, add a `transformKey:` method to your category. For example, to turn "userName" into "NSUserDefaultUserName":
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- (NSString *)transformKey:(NSString *)key {
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key = [key stringByReplacingCharactersInRange:NSMakeRange(0,1) withString:[[key substringToIndex:1] uppercaseString]];
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return [NSString stringWithFormat:@"NSUserDefault%@", key];
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}
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### Registering defaults
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Registering defaults can be done as usual, on NSUserDefaults directly (use the same prefix, if any!).
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NSDictionary *defaults = @{
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@"NSUserDefaultUserName": @"default",
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@"NSUserDefaultUserId": @1
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};
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[[NSUserDefaults standardUserDefaults] registerDefaults:defaults];
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However, it's a lot easier to create a setupDefaults method on the category, which takes care of the transformed keys automatically:
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- (NSDictionary *)setupDefaults {
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return @{
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@"userName": @"default",
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@"userId": @1
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};
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}
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### Performance
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The getter is about 3 times as slow as directly using NSUserDefaults, but we're talking about fractions of a millisecond (0.22 ms vs 0.65 ms on an iPod Touch 4th gen). The setter is about 3 times as slow as well (0.20 ms vs 0.61 ms).
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The numbers vary a bit from device to device and from run to run, but it always seems to be about 1.5 to 3 times as slow. For example on an iPhone 4 the setter takes 0.77 ms vs 0.5 ms when you do it natively.
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## Install
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Install via [CocoaPods](http://cocoapods.org) (`pod 'GVUserDefaults'`) or drag the code in the GVUserDefaults subfolder to your project.
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## Issues and questions
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Have a bug? Please [create an issue on GitHub](https://github.com/gangverk/GVUserDefaults/issues)!
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## Contributing
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GVUserDefaults is an open source project and your contribution is very much appreciated.
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1. Check for [open issues](https://github.com/gangverk/GVUserDefaults/issues) or [open a fresh issue](https://github.com/gangverk/GVUserDefaults/issues/new) to start a discussion around a feature idea or a bug.
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2. Fork the [repository on Github](https://github.com/gangverk/GVUserDefaults) and make your changes on the **develop** branch (or branch off of it). Please retain the code style that is used in the project.
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3. Write tests, make sure everything passes.
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4. Make sure to add yourself to AUTHORS and send a pull request.
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## License
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GVUserDefaults is available under the MIT license. See the LICENSE file for more info.
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