调整NSAttributedString中使用的图像的大小

Ana 发表于 Dev

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可能重复，但以下可接受的答案是一种简单的单功能解决方案。

我正在尝试制作新闻文章详细信息视图控制器，以在顶部显示文章的图像，然后显示日期，然后显示详细说明。

我了解到，我必须使用NSAttributedString并且只有一个才能使用UITextView。现在一切正常，但是我现在只有一个问题：图像宽度不适合屏幕宽度（或TextView宽度），请参见以下图像：

应用截图

我尝试了一切，但没有任何效果。

如何使图像适合屏幕宽度？

提前致谢。

再次编辑这是涉及的代码：

#import "SingleNewsViewController.h"

@interface SingleNewsViewController ()

@end

@implementation SingleNewsViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    NSAttributedString *image = [self imageString];
    NSAttributedString *date = [self dateString];
    NSAttributedString *body = [self bodyString];

    NSMutableAttributedString *wholeStory = [NSMutableAttributedString new];

    // TODO: can you be sure image, date and body are all non-nil?
    NSArray *allComponents = @[image, date, body];
    for(NSAttributedString *component in allComponents)
    {
        [wholeStory appendAttributedString:component];
        if(component != [allComponents lastObject])
            [[wholeStory mutableString] appendString:@"\n\n"];
    }

    self.tv.attributedText = wholeStory;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (UIImage *)image
{
    return [UIImage imageNamed:@"latest_news_img.jpg"];
}

- (NSString *)dateText
{
    return @"Hi There, this is date!";
}

- (NSString *)bodyText
{
    return @"Hi There, this is body text!Hi There, .....";
}

- (NSAttributedString *)imageString
{
    NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init];
    textAttachment.image = [self image];
    return [NSAttributedString attributedStringWithAttachment:textAttachment];
}

- (NSAttributedString *)dateString
{
    return [[NSAttributedString alloc]
            initWithString:[self dateText]
            /*attributes:
             @{
             NSFontAttributeName: [UIFont preferredFontForTextStyle: UIFontTextStyleSubheadline],
             ... etc ...
             }*/];
}

- (NSAttributedString *)bodyString
{
    return [[NSAttributedString alloc]
            initWithString:[self bodyText]
            /*attributes:
             @{
             NSFontAttributeName: [UIFont preferredFontForTextStyle: UIFontTextStyleBody],
             ... etc ...
             }*/];
}



@end

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哦对了，所以NSTextAttachment没有图像视图...啊...好吧，然后想到了另一个想法。如何重新整理UIImage数据，然后将该图像传递到NSTextAttachment，如本文所示：

https://stackoverflow.com/a/2658801/4657588

使用此方法相应地调整图像大小：

+ (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
    //UIGraphicsBeginImageContext(newSize);
    // In next line, pass 0.0 to use the current device's pixel scaling factor (and thus account for Retina resolution).
    // Pass 1.0 to force exact pixel size.
    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();    
    UIGraphicsEndImageContext();
    return newImage;
}

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