44.将图片写入本地

1.方法1,推荐使用

           NSData *data = [[NSData alloc]initWithBase64EncodedString:message.msg1 options:(NSDataBase64DecodingIgnoreUnknownCharacters)];
            NSString *path_document = NSHomeDirectory();
            //设置一个图片的存储路径
            NSString *imagePath = [path_document stringByAppendingString:[NSString stringWithFormat:@"/Documents/%@.jpg",[self getImageName]]];
            [data writeToFile:imagePath atomically:YES];//这儿是将缩略图写入了本地


2.方法2

//首先将图片转为NSData

NSData *data = [[NSData alloc]initWithBase64EncodedString:message.msg1 options:(NSDataBase64DecodingIgnoreUnknownCharacters)];

 [data writeToFile:[self getImageFilePath] atomically:YES];


- (NSString *)getImageFilePath  {
    NSString *catchPath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).firstObject;
    NSString *imagefilepath = [catchPath stringByAppendingPathComponent:[self getImageName]];
    return imagefilepath;
}
-(NSString *)getImageName
{
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    formatter.dateFormat = @"yyyyMMddHHmmss";
    NSString *str = [formatter stringFromDate:[NSDate date]];
    NSString *imageName = [NSString stringWithFormat:@"%@%d.jpg", str,arc4random()%999999];
    return imageName;
}