將UILabel限制為500個字符，然后在IOS中截斷UIlabel

Question

我想在UILabel中顯示前500個字符，並且如果有500個以上的字符，則要顯示“截斷”圖標。但是我不知道如何限制500個字符來截斷文本？

這是我的代碼

label2 = [[UILabel alloc] initWithFrame:CGRectMake(0, 350, self.bounds.size.width, 30)];
   // In this case value of self.bounds.size.width is "427"

    label2.backgroundColor = [UIColor clearColor];
    label2.numberOfLines = 2;
    label2.textAlignment = UITextAlignmentCenter;
    label2.font = [UIFont systemFontOfSize:13];
    [self addSubview:label2]

         //Here is Implimentation code of my label

 NSString *temp = [galleryEntryTree objectForKey:@"description"];// calling lebel text from database
coverView.label2.text = temp;
coverView.label2.adjustsFontSizeToFitWidth = NO;
coverView.label2.lineBreakMode = UILineBreakModeTailTruncation;

告訴我，我如何顯示至少500個字符，然后截斷它（如果超過500個）

任何幫助表示贊賞

Answer 1

如果字符串超過500個字符，則只需截斷它。 僅警告：請確保不要在代理對中間中斷它：

NSString *temp = [galleryEntryTree objectForKey:@"description"];
if ([temp length] > 500) {
    NSRange range = [temp rangeOfComposedCharacterSequencesForRange:(NSRange){0, 500}];
    temp = [temp substringWithRange:range];
    temp = [temp stringByAppendingString:@" …"];
}
coverView.label2.text = temp;

Answer 2

要僅顯示500個字符，請使用以下代碼：

NSString *string = YOUR_TEXT;
if ([string length] >500) {
    string = [string substringToIndex:500];
}

希望這會幫助你。

祝一切順利 ！！！

Answer 3

這是在Swift 2.2中的操作方法：

let maxLength = 500
if originalString.characters.count > maxLength {
   let range = originalString.rangeOfComposedCharacterSequencesForRange(Range<String.Index>(originalString.startIndex ..< originalString.startIndex.advancedBy(maxLength)))
   let tmpValue = originalString.substringWithRange(range).stringByAppendingString(" …")
   // use tmpValue
}

Answer 4

試試這個，對您有幫助。

label2 = [[UILabel alloc] initWithFrame:CGRectMake(0, 350, self.bounds.size.width, 30)];
   // In this case value of self.bounds.size.width is "427"
 label2.text=@"your text................................";
 if([label2.text length]>500)
        label2.text=[label2.text substringToIndex:500];


    label2.backgroundColor = [UIColor clearColor];
    label2.numberOfLines = 2;
    label2.textAlignment = UITextAlignmentCenter;
    label2.font = [UIFont systemFontOfSize:13];
    [self addSubview:label2]

Answer 5

可以簡單地通過

NSString *LabelNewText = [YourLabelName.text substringToIndex:500];

此處將顯示500個或少於500個字符，超過此限制的所有字符將被截斷。

NSString * string = LabelNewText.text;

if ([string length] >500)
{
   string = [string substringToIndex:500];                                       
}

Answer 6

Swift 3.0版本

let maxLength = 300 //char length
if originalString.characters.count > maxLength {
            let range =  originalString.rangeOfComposedCharacterSequences(for: originalString.startIndex..<originalString.index(originalString.startIndex, offsetBy: maxLength))
            let tmpValue = originalString.substring(with: range).appending("...")
        }