iOS 文件读写

来源：互联网发布：论文数据捏造编辑：程序博客网时间：2024/05/01 06:17

#import <Foundation/Foundation.h>@interface Utils : NSObject+(void) writeFile:(NSString *) filePath data:(NSString *) _data;+(NSString *) readFile:(NSString *) filePath;@end

#import "Utils.h"@implementation Utils+(void) writeFile:(NSString *) filePath data:(NSString *) _data{    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString* fileName = [[paths objectAtIndex:0]stringByAppendingPathComponent:filePath];    NSLog(@"File %@ will write!", fileName);        // 用这个方法来判断当前的文件是否存在，如果不存在，就创建一个文件    NSFileManager *fileManager = [NSFileManager defaultManager];    if ( ![fileManager fileExistsAtPath:fileName]) {        NSLog(@"File %@ not exists!", fileName);        [fileManager createFileAtPath:fileName contents:nil attributes:nil];    }else NSLog(@"File %@ exists!", fileName);            [_data writeToFile:fileName atomically:YES encoding:NSUTF8StringEncoding error:NULL];}+(NSString *) readFile:(NSString *) filePath{    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString* fileName = [[paths objectAtIndex:0]stringByAppendingPathComponent:filePath];    NSLog(@"File %@ will write!", fileName);    NSString* myString = [NSString stringWithContentsOfFile:fileName usedEncoding:NULL error:NULL];    return myString;}@end

调用：

[Utils writeFile:@"/Lein.txt" data:@"123QWE金属材料"];    NSLog(@"Lein.txt:%@", [Utils readFile:@"/Lein.txt"]);

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