iOS NSError 자세히 NSError 오류 코드 대조표 사용자 정의 NSError

1. NSError는 시스템 오류 정보 클래스입니다.
//두 가지 초기화 방법: 그 중에서domain은 비워둘 수 없음dict는 비워둘 수 있음

(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;//오류 도메인
오류 영역은 주로 네 가지가 있는데 카본 프레임워크의 Error에 대해서는 OS Status domain(NSOS Status Error Domain), POSIX error에 대해서는 NSPOSIX Error Domain에 속하고 우리의 iOS 개발에 대해서는 일반적으로 NSCocoa Error Domain을 사용한다.NSError.h가 4개의domain을 정의했습니다.
{
//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;//오류 코드
@property (readonly, copy) NSDictionary *userInfo;//오류 메시지
@property (readonly, copy) NSString *localizedDescription;//현지화 설명 가져오기
@property (nullable, readonly, copy) NSString *localizedFailureReason;//가져오기 실패 원인
@property (nullable, readonly, copy) NSString *localizedRecoverySuggestion;//복구 권장사항 얻기
@property (nullable, readonly, copy) NSArray *localizedRecoveryOptions;로컬 복구 권장 사항
@property (nullable, readonly, strong) id recoveryAttempter;
@property (nullable, readonly, copy) NSString *helpAnchor;
미리 정의된 사용자 info 키 이름
NSString *const NSUnderlyingErrorKey;//일반 키 NSString*const NSLocalizedDescriptionKey를 사용하는 것이 좋습니다.상세 설명 키 NSString*const NSLocalizedFailureReasonErrorKey;//장애 원인 키 NSString*const NSLocalizedRecovery SuggestionErrorKey;//복구 권장 키 NSString*const NSLocalizedRecoveryOptionsErrorKey;//복구 옵션 키
//기타 키
NSString *const NSRecoveryAttempterErrorKey; NSString *const NSHelpAnchorErrorKey; NSString *const NSStringEncodingErrorKey ; NSString *const NSURLErrorKey; NSString *const NSFilePathErrorKey;
사용 예:

NSDictionary *userInfo1 = [NSDictionary dictionaryWithObjectsAndKeys:@"       ，    ", NSLocalizedDescriptionKey, @"    ：     ", NSLocalizedFailureReasonErrorKey, @"    ：      ",NSLocalizedRecoverySuggestionErrorKey,nil];

NSError *error = [[NSError alloc] initWithDomain:NSCocoaErrorDomain code:4 userInfo:userInfo1];//  code 4，       4       。userinfo userinfo1        。userinfo nil，       。

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

2. NSError 오류 코드 대조표
Foundation Constants Reference NSError Codes
NSError codes in the Cocoa error domain.
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,

} URL Loading System Error Codes
These values are returned as the error code property of an NSError object with the domain “NSURLErrorDomain”.
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 }
3. NSError 사용자 정의
시스템의 NSError는 다음과 같은 코드를 제공하여 사용자 정의할 수 있습니다.
YXError.h와 YXError.m
[objc] view plaincopy

//

//YXError.h

//CustomYXError

//

4

//Copyright(c) 2014년 Y.X. All rights reserved

//

import

4

//자체 오류 코드 추가

typedef enum : NSUInteger {

Crash = -10000,

DisConnect,

Unknow,

} YXErrorCode;

@interface YXError : NSObject

(NSError *)errorCode:(YXErrorCode)code userInfo:(NSDictionary *)dic;

(NSString *)transformCodeToStringInfo:(YXErrorCode)code;

@end

[objc] view plaincopy

//

//YXError.m

//CustomYXError

//

4

//Copyright(c) 2014년 Y.X. All rights reserved

//

import "YXError.h"

static NSDictionary *errorDictionary = nil;

@implementation YXError

(void)initialize

{

if (self == [YXError class])

{

errorDictionary =\

@{

/* code : errorWithDomain */

/* ==================================== */

@(Crash) : @"Crash",

@(DisConnect) : @"DisConnect",

@(Unknow) : @"Unknow",

/* ==================================== */

};

}

}

(NSError *)errorCode:(YXErrorCode)code userInfo:(NSDictionary *)dic

{

return [NSError errorWithDomain:errorDictionary[@(code)]

code:code

userInfo:dic];

}

(NSString *)transformCodeToStringInfo:(YXErrorCode)code

{

return errorDictionary[@(code)];

}

@end

다음은 사용된 코드입니다.
[objc] view plaincopy

import "AppDelegate.h"

import "YXError.h"

@implementation AppDelegate

(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

4

//NSError 사용자 정의 4

NSError *error = [YXError errorCode:Crash

userInfo:nil];

NSLog(@"%@", error);

4

//NSError 한 개 번역(code 값을 문자열로 번역)

NSLog(@"%@", [YXError transformCodeToStringInfo:-10000]);

return YES;

}

@end

참조 링크:https://blog.csdn.net/hdfqq188816190/article/details/52754943