对象 - 单词行截断 [英] Obj c - Word Line Truncation

问题描述

I want to show my long text in a UILabel. But, My design having small size of frame for that UILabel. So, i want to truncate my long text like this[see below]:

Ex:

Given Text: "I want to show my long text in a UILabel"

Recent Result: [Using lineBreakMode:]
1. I want to s........a UILabel
2. I want to s.....
3. I want to s
 
Excepting Result: "I want to...."

[Note:  I want truncation after the word which can fit within their label frame.]

I hope that you can sense about my excepting result. Am weak in English!.

推荐答案

UILabel有一个属性 lineBreakMode 即可。



提示：Apple文档非常好，所以仔细阅读以了解所有功能。

The UILabel has a property lineBreakMode that is the way to go.

tip: the Apple documentation is very good, so read it carefully to understand all features.

1周后，我自己找到了解决方案。请检查代码的有效性并对其进行评论。



我的解决方案处理您为控制文本标题提供的多行文本。



尝试这种类型的截断!!!



解决方案：

After 1 week, i found solution myself. Please check the efficient of the code and comment it.

My solution handles multiple number of lines of text you given for your control title of text.

Taste this type of truncation!!!

Solution:

-(NSString *)methodForDisplayTextWithTruncate:(UILabel *)lblFinalResult{

    NSLog(@"Old Frame: %@", NSStringFromCGRect(lblFinalResult.frame));
    NSLog(@"Event Length: %i", [lblFinalResult.text length]);

    NSString *strGivenText, *strFuncResult, *stringThatFits, *backupStr;
    int i,checkpoint=lblFinalResult.numberOfLines,bound=0;
    NSArray *arrForGivenText_Words;
    NSMutableArray *mutArrForWords;

    stringThatFits=@"";
    strFuncResult=@"";
    backupStr=@"";
    mutArrForWords=[[NSMutableArray alloc] initWithObjects:nil];

    //Custom Truncate Function
    strGivenText=lblFinalResult.text;
    arrForGivenText_Words = [strGivenText componentsSeparatedByString:@" "];

    for(int y=0; y<[arrForGivenText_Words count];y++){
        if(![[arrForGivenText_Words objectAtIndex:y] isEqualToString:@""]){
            [mutArrForWords addObject:[arrForGivenText_Words objectAtIndex:y]];
        }
    }
//    NSLog(@"Corrected:%@",mutArrForWords);

    for (i=0; i < [mutArrForWords count]; i++)
    {
        /* must follow @" %@" - a space before %@ */
        NSString *tempString = [stringThatFits stringByAppendingFormat:@"%@ ", mutArrForWords[i]];
        NSLog(@"TempString:%@",tempString);

        CGRect boundingRect = [tempString boundingRectWithSize:CGSizeMake(999, 999)                                                       options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:lblFinalResult.font} context:nil];

        if (boundingRect.size.width > lblFinalResult.frame.size.width) {
            NSLog(@"Bound(%i)", bound++);

            if(i==0){
                [lblFinalResult setText:@"..."];
                NSLog(@"New Frame: %@", NSStringFromCGRect(lblFinalResult.frame));
                return lblFinalResult.text;
            }
            if(checkpoint>1){
                backupStr=@"";
                for (int j = 0 ; j < i; j++){
                    backupStr=[backupStr stringByAppendingFormat:@"%@ ", mutArrForWords[j]];
                }
                NSLog(@"Backup Bound:%@",backupStr);
                stringThatFits=mutArrForWords[i];
                stringThatFits=[stringThatFits stringByAppendingString:@" "];
                checkpoint--;
            }
            else{
                strFuncResult=@"";
                for (int z = 0 ; z < i; z++)
                {
                    strFuncResult = [strFuncResult stringByAppendingFormat:@"%@ ", mutArrForWords[z]];
                }
                strFuncResult = [strFuncResult substringToIndex:strFuncResult.length-(strFuncResult.length>0)];

                lblFinalResult.frame= CGRectMake(lblFinalResult.frame.origin.x, lblFinalResult.frame.origin.y, lblFinalResult.frame.size.width+10, lblFinalResult.frame.size.height);
                strFuncResult=[strFuncResult stringByAppendingString:@"..."];
                [lblFinalResult setText:strFuncResult];
                NSLog(@"Final_1:%@", lblFinalResult.text);
                NSLog(@"Final Length: %i", [lblFinalResult.text length]);
                NSLog(@"New Frame: %@", NSStringFromCGRect(lblFinalResult.frame));
                return lblFinalResult.text;
            }
        }
        else{
            stringThatFits = tempString;
        }
    }
    stringThatFits=@"";
    for (int z = 0 ; z < i; z++)
    {
        stringThatFits = [stringThatFits stringByAppendingFormat:@"%@ ", mutArrForWords[z]];
    }
    stringThatFits = [stringThatFits substringToIndex:stringThatFits.length-(stringThatFits.length>0)];

    [lblFinalResult setText:stringThatFits];
    NSLog(@"Final_2:%@", lblFinalResult.text);
    NSLog(@"Final Length: %i", [lblFinalResult.text length]);
    NSLog(@"New Frame: %@", NSStringFromCGRect(lblFinalResult.frame));
    return lblFinalResult.text;
}

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