屬性字串顏色-Objective-c-有解無憂

我有一個如圖所示的顯示幕屬性字串顏色-Objective-c

我從一個字串 str 得到這個，如下所示屬性字串顏色-Objective-c

我試過的代碼

lbl1.text=newStr;
NSString *textxtra = @"Xtra";
NSString *textremove = @"Remove";

NSMutableAttributedString *attrsString = [[NSMutableAttributedString alloc] initWithAttributedString:lbl1.attributedText];

 // search for word occurrence
                    
NSRange range = [lbl1.text rangeOfString:textxtra];
NSRange range1 = [lbl1.text rangeOfString:textremove];
if (range.location != NSNotFound) {
    [attrsString addAttribute:NSForegroundColorAttributeName value:[UIColor systemGreenColor] range:range];
}
if (range1.location != NSNotFound) {
    [attrsString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:range1];
}

// set attributed text
lbl1.attributedText = attrsString;

如何在 Xtra (American Cheese) 之前和 Xtra($1) 之后以綠色獲取字串？

Remove（House Mayo）之前的部分是紅色的？即整個字串American Cheese: Xtra $1應該在green color. 我的想法是在 Xtra upto \n 之前的 \nie 字串和 Xtra upto \n 之后的字串之間取字串，但無法準確理解如何實作

任何想法/建議都會有所幫助

uj5u.com熱心網友回復：

未經測驗，但這應該可以解決問題：

NSString *initialSting = @"";

NSArray *lines = [initialSting componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];

NSMutableArray *attributedLines = [[NSMutableArray alloc] init];
NSDictionary *redAttributes =  @{};
NSDictionary *greenAttributes =  @{};

for (NSString *aLine in lines) 
{
    NSAttributedString *aLineAttributedString;
    //Here, you could also check, that the string is like "someString: Xtra someOtherString", because if Xtra is misplaced...
    if ([aLine containsString:@"Xtra"]) 
    {
        aLineAttributedString = [[NSAttributedString alloc] initWithString:aLine attributes:greenAttributes];
        //Here, you could also check, that the string is like "someString: Remove someOtherString", because if Remove is misplaced...
    }
    else if ([aLine containsString:@"Remove"]) 
    {
        aLineAttributedString = [[NSAttributedString alloc] initWithString:aLine attributes:redAttributes];
    } 
    else 
    {
        aLineAttributedString = [[NSAttributedString alloc] initWithString:aLine];
    }
    [attributedLines addObject:aLineAttributedString];
}

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] init];
NSAttributedString *newLine = [[NSAttributedString alloc] initWithString:@"\n"];

if ([attributedLines count] > 0) 
{
    for (NSUInteger i = 0; i < [attributedLines count] - 1; i  ) 
    {
        [attributedString appendAttributedString:attributedLines[i]];
        [attributedString appendAttributedString:newLine];
    }
    [attributedString appendAttributedString:[attributedLines lastObject]];
}

邏輯：使用 Create an array of
為每一行獲取一個 NSString陣列，該陣列將為每一行填充。對于每一行，如果需要，為它著色，然后將其添加到陣列中。最后，沒有for ，所以做一個手動 for 回圈來重建 final 。componentsSeparatedByCharactersInSet:
NSAttributedString

componentsJoinedByString:NSAttributedStringNSAttributedString

轉載請註明出處，本文鏈接：https://www.uj5u.com/qukuanlian/467278.html

標籤：IOS 目标-c nsattributedstring

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