将UILabel限制为500个字符,然后在IOS中截断UIlabel

Question

我想在UILabel中显示前500个字符,如果有超过500个字符,则显示截断图标.但我不知道如何限制500个字符来截断文本？

这是我的代码

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;

告诉我们伙计们如何显示最少500个字符而不是截断它(如果超过500个)

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Answer 1

如果字符串长度超过500个字符,则截断该字符串.只有警告:确保不要在代理对中间打破它:

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;