// // TextHander.h // OC10_文件練習 // // Created by zhangxueming on 15/6/19. // Copyright (c) 2015年 zhangxueming. All rights reserved. // #import <Foundation/Foundation.h>@interface TextHander : NSObject+ (void)replaceStringInTextFile:(NSString *)path withOldString:(NSString *)dstString toNewString:(NSString *)newString;+ (void)replaceStringInDirectory:(NSString *)path withOldString:(NSString *)dstString toNewString:(NSString *)newString fileType:(NSString *)type;@end // // TextHander.m // OC10_文件練習 // // Created by zhangxueming on 15/6/19. // Copyright (c) 2015年 zhangxueming. All rights reserved. // #import "TextHander.h"@implementation TextHander+ (void)replaceStringInTextFile:(NSString *)path withOldString:(NSString *)dstString toNewString:(NSString *)newString {//備份文件 /name /name_bakNSFileManager *fm = [NSFileManager defaultManager];[fm copyItemAtPath:path toPath:[path stringByAppendingString:@"_bak"] error:nil];//1.創建文件句柄NSFileHandle *fh = [NSFileHandle fileHandleForUpdatingAtPath:path];//2.讀取文件NSData *data = [fh readDataToEndOfFile];NSString *dataString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];//3.替換內容dataString = [dataString stringByReplacingOccurrencesOfString:dstString withString:newString];//4.文件清空[fh truncateFileAtOffset:0];//5.寫文件 [fh writeData:[dataString dataUsingEncoding:NSUTF8StringEncoding]];//6.同步文件 [fh synchronizeFile];//7.關閉文件 [fh closeFile]; }+ (void)replaceStringInDirectory:(NSString *)path withOldString:(NSString *)dstString toNewString:(NSString *)newString fileType:(NSString *)type {//1.遍歷目錄NSFileManager *fm = [NSFileManager defaultManager];NSArray *contents = [fm subpathsOfDirectoryAtPath:path error:nil];// /dic/filename.txt//2.遍歷數組 找到指定類型的文件for (NSString *item in contents) {NSString *name = [item pathExtension];if ([name isEqualToString:type]) {[self replaceStringInTextFile:[path stringByAppendingFormat:@"/%@",item] withOldString:dstString toNewString:newString];}} }@end // // main.m // OC10_文件練習 // // Created by zhangxueming on 15/6/19. // Copyright (c) 2015年 zhangxueming. All rights reserved. // #import <Foundation/Foundation.h> #import "TextHander.h"//把path指定的文件中的字符串 "him" 替換為 "me”//[LZXTextHandle replaceStringInTextFile:FILE_PATH withOldString:@"him" toNewString:@"me"]; //以下代碼的作用: //把path指定的文件夾中的txt文件中的字符串"him"替換為字符串"me"//[LZXTextHandle replaceStringInDirectory:DIR_PATH withOldString:@"him" toNewString:@"me" fileType:@"txt"]; int main(int argc, const char * argv[]) {@autoreleasepool {// insert code here...//NSLog(@"Hello, World!");//[TextHander replaceStringInTextFile:@"/Users/zhangxueming/Desktop/Test/3.txt" withOldString:@"him" toNewString:@"me"];[TextHander replaceStringInDirectory:@"/Users/zhangxueming/Desktop/Test" withOldString:@"him" toNewString:@"me" fileType:@"txt"];}return 0; }

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轉載于:https://www.cnblogs.com/0515offer/p/4589619.html

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