iOS 将text文本转为image

最新推荐文章于 2021-06-02 23:12:58 发布

原创最新推荐文章于 2021-06-02 23:12:58 发布 · 9.3k 阅读

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文章标签：

#ios

本文介绍了一种将iOS中的UILabel视图转换为UIImage的方法，并展示了如何通过代码实现这一过程。此外，还提供了一个将字符串绘制为图片的示例。

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直接上代码

- (UIImage *)imageFromString:(NSString *)string attributes:(NSDictionary *)attributes size:(CGSize)size
{
    UIGraphicsBeginImageContextWithOptions(size, NO, 0);
    [string drawInRect:CGRectMake(0, 0, size.width, size.height) withAttributes:attributes];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return image;
}


- (UIImage *)imageForView:(UIView *)view
{
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, NO, 0);

    if ([view respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)])
        [view drawViewHierarchyInRect:view.bounds afterScreenUpdates:YES];
    else
        [view.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return image;
}

- (void)viewDidLoad {
    [super viewDidLoad];

    UIImageView *imgview = [[UIImageView alloc] initWithFrame:CGRectMake(20, 100, 40, 40)];
    imgview.backgroundColor = [UIColor colorWithRed:160/255.0 green:176/255.0 blue:213/255.0 alpha:1.0];
    imgview.layer.cornerRadius = 20;
    [self.view addSubview:imgview];

    UILabel *temptext  = [[UILabel alloc] initWithFrame:CGRectMake(10, 10, 40, 40)];
    temptext.text = @"好";
    temptext.textColor = [UIColor whiteColor];
    temptext.textAlignment = NSTextAlignmentCenter;
    UIImage *image  = [self imageForView:temptext];
    imgview.image = image;

  /*
    NSString *string = @"字";
    NSMutableParagraphStyle* paragraphStyle = [[NSMutableParagraphStyle alloc]init];
    [paragraphStyle setAlignment:NSTextAlignmentCenter];
    [paragraphStyle setLineBreakMode:NSLineBreakByCharWrapping];
    [paragraphStyle setLineSpacing:15.f];  //行间距
    [paragraphStyle setParagraphSpacing:2.f];//字符间距

    NSDictionary *attributes = @{NSFontAttributeName            : [UIFont systemFontOfSize:12],
                                 NSForegroundColorAttributeName : [UIColor blueColor],
                                 NSBackgroundColorAttributeName : [UIColor clearColor],
                                 NSParagraphStyleAttributeName : paragraphStyle, };


    UIImage *image1  = [self imageFromString:string attributes:attributes size:imgview.bounds.size];
    imgview.image = image1;
   */
}

效果：