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(@"\n lineFrag={%f,%f,%f,%f} \n",lineFrag.origin.x,lineFrag.origin.y,lineFrag.size.width,lineFrag.size.height);
NSLog(@"\n glyphPosition={%f,%f} \n",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setNeedsDisplay
}];
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(@"\n range1 = %@ \n",NSStringFromRange(range1));
NSRange range2 = [[string string] rangeOfString:@"#abcdef "];
[string addAttribute:NSLinkAttributeName
value:@"URL://jsonstring"
range:range2];
NSLog(@"\n range2 = %@ \n",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).