June 2013
Intermediate to advanced
360 pages
6h 50m
Chinese
Content preview from COCOA學習手冊--使用OBJECTIVE-C第三版
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第九章
因為儲存在
NSUserDefaults
物件內的值經常是數字或布林值之類的東西，
NSUserDefaults
提供許多直接存取非物件值的便捷方法︰
int integerSetting = [[NSUserDefaults standardUserDefaults]
integerForKey:@"integerSetting"];
float floatSetting = [[NSUserDefaults standardUserDefaults]
floatForKey:@"floatSetting"];
BOOL booleanSetting = [[NSUserDefaults standardUserDefaults]
boolForKey:@"booleanSetting"];
還有其他方法可從
NSUserDefaults
物件擷取值，更多資訊請參考 Xcode
文件說明裡的〈
Preferences and Settings Programming Guide
〉（
http:// bit.ly/
SQznt7
）。
設定偏好設定
除了從預設物件擷取值之外，你也可以設定值。當你在
NSUserDefaults
物件裡設定值
時，該值將被保存下來（直到應用程式從系統中被移除）。
要在
NSUserDefaults
物件裡設定物件，可利用
setObject:forKey:
方法，就像
NSMutableDictionary
那樣︰
NSString* greeting = @"hello"
[[NSUserDefaults ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.