IOS7 textkit 的相关

去年基于5.0开发的时候。自己用coreText编写了一个富文本,全部的效果都实现的非常好。可是没有去測试效率。只是在cell重用的时候表现不错。在4s上面也不会卡顿。

唯一一个问题就是,在使用AL的时候。不方便。

所以,此次新版本号是基于7.0开发。决定使用textkit又一次编写一次。

以下是一些主要的使用:

@interface MMTextAttachment : NSTextAttachment
{
    
}

@end

@implementation MMTextAttachment

//I want my emoticon has the same size with line's height
- (CGRect)attachmentBoundsForTextContainer:(NSTextContainer *)textContainer proposedLineFragment:(CGRect)lineFrag glyphPosition:(CGPoint)position characterIndex:(NSUInteger)charIndex NS_AVAILABLE_IOS(7_0)
{
    NSLog(@"
 lineFrag={%f,%f,%f,%f} 
",lineFrag.origin.x,lineFrag.origin.y,lineFrag.size.width,lineFrag.size.height);
    NSLog(@"
 glyphPosition={%f,%f} 
",position.x,position.y);
    CGFloat lineHeight = lineFrag.size.height;
    CGFloat abc = 21.0;
    return CGRectMake( 0 , (lineHeight - abc)/2.0 , abc , abc);
}

能够使用UITextView 或 UILabel,可是UITextView能够检測链接等。以下先看下UITextView

// 点击处理
    // http://stackoverflow.com/questions/19332283/detecting-taps-on-attributed-text-in-a-uitextview-on-ios-7
    NSMutableAttributedString * string = [[ NSMutableAttributedString alloc ] initWithString:@"1@谭中洞 2345678910 http://gutou.com 1112what happendwhatg一个地址 重庆市渝中区210号 02364646464 happendwhat happendwhat happendwhat happendwhat happend This is an example by @marcelofabri_ #abcdef "  attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:14.0]} ] ;
    MMTextAttachment * textAttachment = [[ MMTextAttachment alloc ] initWithData:nil ofType:nil ] ;
    textAttachment.image = [UIImage imageNamed:@"002.png"] ;
    NSAttributedString * textAttachmentString = [ NSAttributedString attributedStringWithAttachment:textAttachment ] ;
    [string insertAttributedString:textAttachmentString atIndex:7] ;
    
    MMTextAttachment * textAttachmen2t = [[ MMTextAttachment alloc ] initWithData:nil ofType:nil ] ;
    
    [[SDWebImageManager sharedManager] downloadImageWithURL:[NSURL URLWithString:@"https://www.baidu.com/img/baidu_jgylogo3.gif?v=27357745.gif"] options:0 progress:nil completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
        // 使用网络下载,下载完毕后,又一次刷新下这个range
        textAttachmen2t.image = image;
        [_textView.layoutManager invalidateDisplayForCharacterRange:NSMakeRange(57, 1)]; // UILabel能够使用<span style="font-family: monospace; white-space: pre; background-color: rgb(240, 240, 240);">setNeedsDisplay
</span>    }];
    
    NSAttributedString * textAttachmentStr2ing = [ NSAttributedString attributedStringWithAttachment:textAttachmen2t ] ;
    [string insertAttributedString:textAttachmentStr2ing atIndex:57] ;
    //
    NSRange range1 = [[string string] rangeOfString:@"@marcelofabri_"];
    [string addAttribute:NSLinkAttributeName
                   value:@"URL://jsonstring"
                   range:range1];
    NSLog(@"
 range1 = %@ 
",NSStringFromRange(range1));
    NSRange range2 = [[string string] rangeOfString:@"#abcdef "];
    [string addAttribute:NSLinkAttributeName
                   value:@"URL://jsonstring"
                   range:range2];
    NSLog(@"
 range2 = %@ 
",NSStringFromRange(range2));
    
//    [string addAttributes:@{NSForegroundColorAttributeName: [UIColor blueColor]} range:range1];
//    [string addAttributes:@{NSForegroundColorAttributeName: [UIColor greenColor]} range:range2];
    
    /*
     // 自定link的颜色
     NSDictionary *linkAttributes = @{
     NSForegroundColorAttributeName: [UIColor blueColor],
     NSUnderlineColorAttributeName: [UIColor redColor],
     NSUnderlineStyleAttributeName: @(NSUnderlinePatternSolid)
     };
     _textView.linkTextAttributes = linkAttributes; // customizes the appearance of links
     */
    _textView.dataDetectorTypes = UIDataDetectorTypeLink;
    _textView.attributedText = string ;
    _textView.selectable = YES; // 才干实现点击delegate
    _textView.scrollEnabled = NO;// 设置为AL后才会自己主动算高
    _textView.editable = NO;
    _textView.delegate = self;

实现UITextViewDelegate

- (BOOL)textView:(UITextView *)textView shouldInteractWithURL:(NSURL *)URL inRange:(NSRange)characterRange

以上能够看到,网络下载,@等URL就都能够实现了。可是因为APPLE 在UITextView中把非常多方法都实现了。所以导致。并不能非常好的控制。

比方URL检測,全部的URL都会被检測出来。另外@、#等为了表现为不同的颜色,也不好控制了。

另一个,我不知道怎么解决的是:当点击链接的时候,就算是手指滑出链接范围。delegate还是会触发,这个不太好。另一种推断点击,大家能够參考 

http://stackoverflow.com/questions/19332283/detecting-taps-on-attributed-text-in-a-uitextview-on-ios-7

明天准备花一天时间,结合曾经写过的又一次编写一次。假设有啥兴许再补充。


之前写过的解析有表情,@ ## 等能够点击的URL,以下是效果图



不知道为什么底部会加入一个版权全部。我了个去~~ 随便转,不要看以下的,(可是也请注明出处).

原文地址:https://www.cnblogs.com/llguanli/p/7001419.html