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
- 先把base64Str转成UIImage
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;
}
- 创建文件名和保存目录
///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];
- 开始绘制PDF
// 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();
- 输出保存目录【fileNamePath】
