将文字导出为.png .jpg .pdf 的文件

1. 将将NSString类型转成UIImage类型

#pragma 将文字转成图片

+(UIImage *)imageFromText:(NSArray *)arrContent withFont:(CGFloat)fontSize{

     //   arrContent为字符数组

    UIFont * font = [UIFont systemFontOfSize:fontSize];
    
    NSMutableArray * arrHeight = [[NSMutableArray alloc]initWithCapacity:arrContent.count];
    
    CGFloat fHeight = 0.0f;
    
    
    //计算文字的长度
    for (NSString * sContent in arrContent) {
        
        CGSize  size = CGSizeMake(320, MAXFLOAT);
        
        NSDictionary * dic = [NSDictionary dictionaryWithObjectsAndKeys:font,NSFontAttributeName, nil];
        
        size = [sContent boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin |NSStringDrawingUsesFontLeading  attributes:dic context:nil].size;
        
        [arrHeight addObject:[NSNumber numberWithFloat:size.height]];
        
        fHeight += size.height;
        
    }
    
    CGSize newSize = CGSizeMake(320+20, fHeight+50);
    
    //制作图片
    UIGraphicsBeginImageContextWithOptions(newSize,NO,0.0);
    
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    
    CGContextSetCharacterSpacing(ctx, 10);
    
    CGContextSetTextDrawingMode (ctx, kCGTextFillStroke);
    
    CGContextSetRGBFillColor (ctx, 0.1, 0.2, 0.3, 1); // 6
    
    CGContextSetRGBStrokeColor (ctx, 0, 0, 0, 1);
    
    
    int nIndex = 0;
    
    CGFloat fPosY = 20.0f;
    
    for (NSString *sContent in arrContent) {
        
        NSNumber *numHeight = [arrHeight objectAtIndex:nIndex];
        
        CGRect rect = CGRectMake(10, fPosY, 320 , [numHeight floatValue]);
        
        [sContent drawInRect:rect withFont:font lineBreakMode:UILineBreakModeWordWrap alignment:UITextAlignmentLeft];
        
        fPosY += [numHeight floatValue];
        
        nIndex++;
        
    }
    
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    
    UIGraphicsEndImageContext();
    
    return image;
    
}

2.将 UIImage 类型 写入 文件(.png 或 ,jpg)

#pragma 将UIImage写入文件
+(BOOL)WriteImage:(UIImage *)image toFileAtPath:(NSString *)aPath{
    
    if ((image == nil) || (aPath == nil) || ([aPath isEqualToString:@""])){
        
        return NO;
        
    }
  
    @try {
        
        NSData * imageData = nil;
        
        NSString * ext = [aPath pathExtension];
        
        if ([ext isEqualToString:@"png"]) {
            
            imageData = UIImagePNGRepresentation(image);
            
        }else{
            
            imageData = UIImageJPEGRepresentation(image, 0);
            
        }
        
        if ((imageData == nil) || ([imageData length] <= 0)) {
            
            return NO;
            
        }
        
        [imageData writeToFile:aPath atomically:YES];
        
        return YES;
        
    } @catch (NSException *exception) {
        
        NSLog(@"%@",exception);
        
    } @finally {
        
    }
    
}

3.将 UIView 类型 转 PDF 文件

#pragma mark - View转PDF文件
+(BOOL)CreatPDFFromUIView:(UIView *)View aPath:(NSString *)path{
    
    BOOL res;
    
    NSMutableData * pdfData = [NSMutableData data];
    
    UIGraphicsBeginPDFContextToData(pdfData,(CGRect){0,0,View.frame.size},nil);
    
    UIGraphicsBeginPDFPageWithInfo(CGRectMake(0,0,View.frame.size.width,View.frame.size.height),nil);
    
    CGContextRef pdfContext=UIGraphicsGetCurrentContext();
    
    CGRect origSize = View.frame;
    
    CGRect newSize = origSize;
    
    newSize.size = View.frame.size;
    
    [View setFrame:newSize];
    
    [View.layer renderInContext:pdfContext];
    
    [View setFrame:origSize];
    
    UIGraphicsEndPDFContext();
    
    //将数据转成写入文件
    res = [pdfData writeToFile:path atomically:YES];

    
    return res;
    
}