好程序员-ios开发小知识点(一)

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1、1、获取系统语言设置NSUserDefaults*userDefault=[NSUserDefaultsstandardUserDefaults];NSArray*languages=[userDefaultobjectForKey:@"AppleLanguages"];NSString*preferredLang=[languagesobjectAtIndex:0]；2、缓存路径下文件大小-(unsignedlonglongint)cacheFolderSize{NSFileManager*_manager=[NSFileManagerdefaultManager];NSArray

2、*_cachePaths=NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES);NSString*_cacheDirectory=[_cachePathsobjectAtIndex:];NSArray*_cacheFileList;NSEnumerator*_cacheEnumerator;NSString*_cacheFilePath;unsignedlonglongint_cacheFolderSize=;_cacheFileList=[_managersubpathsAtPath:

3、_cacheDirectory];_cacheEnumerator=[_cacheFileListobjectEnumerator];while(_cacheFilePath=[_cacheEnumeratornextObject]){NSDictionary*_cacheFileAttributes=[_managerfileAttributesAtPath:[_cacheDirectorystringByAppendingPathComponent:_cacheFilePath]traverseLink:YES];_cacheFolderSize+=[_cacheFileAttr

4、ibutesfileSize];}//单位是字节return_cacheFolderSize;}3、Popoverpush时Frame无法改变解决办法在popover中的ViewController中实现：-(void)viewWillAppear:(BOOL)animated {CGSizesize=CGSizeMake(320,480);//sizeofviewinpopoverself.contentSizeForViewInPopover=size;[superviewWillAppear:animated];}4、tableview滑动导致NSTimer和委托回调停止解决办

5、法//请求回调NSURLRequest*请求=...scheduleInRunLoop：[NSRunLoopcurrentRunLoop] forMode：NSRunLoopCommonModes] [连接开始]//定时器回调NSTimer*updateTimer=[NSTimerscheduledTimerWithTimeInterval：0.01f目标：自我选择：选择（updatePencent）的UserInfo：无重复：是];*NSRunLoop主要=[NSRunLoopcurrentRunLoop] [主要addTimer：updateTimerforMode：NSRunL

6、oopCommonModes];5、手势识别类UIGestureRecognizer6、SFHFKeychainUtils存储信息苹果SDK自带的就有密码保护，使用方法很简单，如下：1、引入Security.frameWork框架。2、引入头文件：SFHKeychainUtils.h.3、存密码：[SFHFKeychainUtilsstoreUsername:@"dd"andPassword:@"aa"forServiceName:SERVICE_NAMEupdateExisting:1error:nil];[SFHFKeychainUtilsdeleteItemForUsernam

7、e:@"dd"andServiceName:SERVICE_NAMEerror:nil];4、取密码：NSString*passWord=[SFHFKeychainUtilsgetPasswordForUsername:@"dd"andServiceName:SERVICE_NAMEerror:nil];7、missingrequiredarchitecturei386infile解决办法在TargetInfo里面修改FrameworkSearchPast