把UIImage转成PDF进行保存

问题

最近有个场景，需要把H5传递过来的base64保存为PDF文件，经解析，H5是直接把png转base64，保存下来的文件就算是重命名为【xxx.pdf】，依然还是没法在【文件.app】中打开，只能把base64转成UIImage，再通过绘制PDF来进行保存

解决方案

1. 先把base64Str转成UIImage

代码语言：javascript复制

UIImage * imgForBase64 = [UIImage imageFromBase64ToWithStr:self.base64Data];

/// base64str->Image
  (UIImage *)imageFromBase64ToWithStr:(NSString *)str{
    
    NSString *base64Str = [str copy];
    if ([base64Str containsString:@"data:image/jpeg;base64,"]) {
        base64Str = [base64Str stringByReplacingOccurrencesOfString:@"data:image/jpeg;base64," withString:@""];
    }else if ([base64Str containsString:@"data:image/png;base64,"]) {
        base64Str = [base64Str stringByReplacingOccurrencesOfString:@"data:image/png;base64," withString:@""];
    }
    if (kStringIsEmpty(base64Str)) {
        return nil;
    }
    NSData *decodeData = [[NSData alloc]initWithBase64EncodedString:base64Str options:NSDataBase64DecodingIgnoreUnknownCharacters];
    UIImage *image = [[UIImage alloc]initWithData:decodeData];
    return image;
}

1. 创建文件名和保存目录

代码语言：javascript复制

///文件夹根目录
    NSString * localFileDirectory = [PATH_OF_DOCUMENT stringByAppendingPathComponent:@"/PDF"];
    
    NSFileManager *fileManger = [NSFileManager defaultManager];
    //  创建文件夹目录
    if (![[NSFileManager defaultManager] contentsOfDirectoryAtPath:localFileDirectory error:nil]) {
        [fileManger createDirectoryAtPath:localFileDirectory withIntermediateDirectories:YES attributes:nil error:nil];
    }
    //  创建文件路径
    NSString *fileNamePath = [localFileDirectory stringByAppendingPathComponent:self.fileName];

1. 开始绘制PDF

代码语言：javascript复制

 // 绘制PDF
    CGRect frame = CGRectMake(0, 0, imgForBase64.size.width, imgForBase64.size.height);
    // Create the PDF context using the default page size of 612 x 792.
    UIGraphicsBeginPDFContextToFile(fileNamePath, CGRectZero, nil);
    // Mark the beginning of a new page.
    UIGraphicsBeginPDFPageWithInfo(frame, nil);
    [imgForBase64 drawInRect:frame];
    // Close the PDF context and write the contents out.
    UIGraphicsEndPDFContext();

1. 输出保存目录【fileNamePath】

html5

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