iOS NSError错误code对照表

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一、NSError是系统错误信息类

两种初始化方法：其中，domain 不能为空 dict可以为空

- (instancetype)initWithDomain:(NSErrorDomain)domain code:(NSInteger)code userInfo:(nullable NSDictionary *)dict;

+ (instancetype)errorWithDomain:(NSErrorDomain)domain code:(NSInteger)code userInfo:(nullable NSDictionary *)dict;

@property (readonly, copy) NSErrorDomain domain;//错误域

错误域主要有四个，对于Carbon框架的Error，归于OSStatus domain（NSOSStatusErrorDomain），对于POSIX error，归于NSPOSIXErrorDomain，而对于我们的iOS开发，一般使用NSCocoaErrorDomain。NSError.h定义了四个domain

{
// Predefined domain for errors from most AppKit and Foundation APIs.
FOUNDATION_EXPORT NSErrorDomain const NSCocoaErrorDomain;

// Other predefined domains; value of "code" will correspond to preexisting values in these domains.
FOUNDATION_EXPORT NSErrorDomain const NSPOSIXErrorDomain;
FOUNDATION_EXPORT NSErrorDomain const NSOSStatusErrorDomain;
FOUNDATION_EXPORT NSErrorDomain const NSMachErrorDomain;
}

@property (readonly) NSInteger code;//错误代码

@property (readonly, copy) NSDictionary *userInfo;//错误信息


@property (readonly, copy) NSString *localizedDescription;//获取本地化描述


@property (nullable, readonly, copy) NSString *localizedFailureReason;//获取失败原因


@property (nullable, readonly, copy) NSString *localizedRecoverySuggestion;//获取恢复建议


@property (nullable, readonly, copy) NSArray *localizedRecoveryOptions;本地恢复建议


@property (nullable, readonly, strong) id recoveryAttempter;


@property (nullable, readonly, copy) NSString *helpAnchor;

预定义的userinfo键名

 NSString *const NSUnderlyingErrorKey;//推荐的标准方式，通用键
 NSString *const NSLocalizedDescriptionKey;             // 详细描述键
 NSString *const NSLocalizedFailureReasonErrorKey;      // 失败原因键
 NSString *const NSLocalizedRecoverySuggestionErrorKey; //恢复建议键
 NSString *const NSLocalizedRecoveryOptionsErrorKey;    // 恢复选项键
//其他键
 NSString *const NSRecoveryAttempterErrorKey;    
 NSString *const NSHelpAnchorErrorKey;              
 NSString *const NSStringEncodingErrorKey ;  
 NSString *const NSURLErrorKey;       
 NSString *const NSFilePathErrorKey;

用法示例：

NSDictionary *userInfo1 = [NSDictionary dictionaryWithObjectsAndKeys:@"由于文件不存在，无法打开", NSLocalizedDescriptionKey, @"失败原因：文件不存在", NSLocalizedFailureReasonErrorKey, @"恢复建议：请创建该文件",NSLocalizedRecoverySuggestionErrorKey,nil];
    
NSError *error = [[NSError alloc] initWithDomain:NSCocoaErrorDomain code:4 userInfo:userInfo1];

此处code是4，对照下面对照表4代表文件不存在。userinfo传userinfo1 查看自定义打印。userinfo传nil，查看本地化描述。

    NSLog(@"========%@",[error localizedDescription]);
    NSLog(@"========%@",[error localizedFailureReason]);
    NSLog(@"========%@",[error localizedRecoverySuggestion]);

二、NSError错误code对照表

enum {
    NSFileNoSuchFileError = 4,
    NSFileLockingError = 255,
    NSFileReadUnknownError = 256,
    NSFileReadNoPermissionError = 257,
    NSFileReadInvalidFileNameError = 258,
    NSFileReadCorruptFileError = 259,
    NSFileReadNoSuchFileError = 260,
    NSFileReadInapplicableStringEncodingError = 261,
    NSFileReadUnsupportedSchemeError = 262,
    NSFileReadTooLargeError = 263,
    NSFileReadUnknownStringEncodingError = 264,
    NSFileWriteUnknownError = 512,
    NSFileWriteNoPermissionError = 513,
    NSFileWriteInvalidFileNameError = 514,
    NSFileWriteInapplicableStringEncodingError = 517,
    NSFileWriteUnsupportedSchemeError = 518,
    NSFileWriteOutOfSpaceError = 640,
    NSFileWriteVolumeReadOnlyError = 642m
    NSKeyValueValidationError = 1024,
    NSFormattingError = 2048,
    NSUserCancelledError = 3072,
    
    NSFileErrorMinimum = 0,
    NSFileErrorMaximum = 1023,
    NSValidationErrorMinimum = 1024,
    NSValidationErrorMaximum = 2047,
    NSFormattingErrorMinimum = 2048,
    NSFormattingErrorMaximum = 2559,
    
    NSPropertyListReadCorruptError = 3840,
    NSPropertyListReadUnknownVersionError = 3841,
    NSPropertyListReadStreamError = 3842,
    NSPropertyListWriteStreamError = 3851,
    NSPropertyListErrorMinimum = 3840,
    NSPropertyListErrorMaximum = 4095
    
    NSExecutableErrorMinimum = 3584,
    NSExecutableNotLoadableError = 3584,
    NSExecutableArchitectureMismatchError = 3585,
    NSExecutableRuntimeMismatchError = 3586,
    NSExecutableLoadError = 3587,
    NSExecutableLinkError = 3588,
    NSExecutableErrorMaximum = 3839,
    
}


typedef enum
{
    NSURLErrorUnknown = -1,
    NSURLErrorCancelled = -999,
    NSURLErrorBadURL = -1000,
    NSURLErrorTimedOut = -1001,
    NSURLErrorUnsupportedURL = -1002,
    NSURLErrorCannotFindHost = -1003,
    NSURLErrorCannotConnectToHost = -1004,
    NSURLErrorDataLengthExceedsMaximum = -1103,
    NSURLErrorNetworkConnectionLost = -1005,
    NSURLErrorDNSLookupFailed = -1006,
    NSURLErrorHTTPTooManyRedirects = -1007,
    NSURLErrorResourceUnavailable = -1008,
    NSURLErrorNotConnectedToInternet = -1009,
    NSURLErrorRedirectToNonExistentLocation = -1010,
    NSURLErrorBadServerResponse = -1011,
    NSURLErrorUserCancelledAuthentication = -1012,
    NSURLErrorUserAuthenticationRequired = -1013,
    NSURLErrorZeroByteResource = -1014,
    NSURLErrorCannotDecodeRawData = -1015,
    NSURLErrorCannotDecodeContentData = -1016,
    NSURLErrorCannotParseResponse = -1017,
    NSURLErrorFileDoesNotExist = -1100,
    NSURLErrorFileIsDirectory = -1101,
    NSURLErrorNoPermissionsToReadFile = -1102,
    NSURLErrorSecureConnectionFailed = -1200,
    NSURLErrorServerCertificateHasBadDate = -1201,
    NSURLErrorServerCertificateUntrusted = -1202,
    NSURLErrorServerCertificateHasUnknownRoot = -1203,
    NSURLErrorServerCertificateNotYetValid = -1204,
    NSURLErrorClientCertificateRejected = -1205,
    NSURLErrorClientCertificateRequired = -1206,
    NSURLErrorCannotLoadFromNetwork = -2000,
    NSURLErrorCannotCreateFile = -3000,
    NSURLErrorCannotOpenFile = -3001,
    NSURLErrorCannotCloseFile = -3002,
    NSURLErrorCannotWriteToFile = -3003,
    NSURLErrorCannotRemoveFile = -3004,
    NSURLErrorCannotMoveFile = -3005,
    NSURLErrorDownloadDecodingFailedMidStream = -3006,
    NSURLErrorDownloadDecodingFailedToComplete = -3007
}

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