Question

我必须制作iPad应用程序。

有三个问题textfields。我必须动态设置宽度UITextField，text来自 webservice 。我必须设置UITextField宽度与问题文本相同..

当文字问题尺寸较小时，UITextField尺寸较小，当文本问题大小很大时，UITextField大小很大，

我有以下代码.....

txtQuestionOne.hidden=NO;
            txtQuestionTwo.hidden=NO;
            txtQuestionThree.hidden=NO;

            imgQueone.hidden=NO;
            imgQueTwo.hidden=NO;
            imgQueThree.hidden=NO;

            [txtQuestionOne setPlaceholder:[[appDelegate.questions objectAtIndex:0] objectForKey:@"question"]];

            appDelegate.FirstQues =[[appDelegate.questions objectAtIndex:0] objectForKey:@"question"];

            NSLog(@"current q1 %@", [[appDelegate.questions objectAtIndex:0] objectForKey:@"question"]);


            if ([[[appDelegate.questions objectAtIndex:0] objectForKey:@"permission"] isEqualToString:@"1"]) {

                ratingButton1.hidden=NO;

                ratingLabel1.hidden=NO;
            }


            [txtQuestionTwo setPlaceholder:[[appDelegate.questions objectAtIndex:1] objectForKey:@"question"]];

            appDelegate.SecondQues =[[appDelegate.questions objectAtIndex:1] objectForKey:@"question"];

            NSLog(@"current q2 %@", [[appDelegate.questions objectAtIndex:1] objectForKey:@"question"]);

            if ([[[appDelegate.questions objectAtIndex:1] objectForKey:@"permission"] isEqualToString:@"1"]) {

                ratingButton2.hidden=NO;

                ratingLabel2.hidden=NO;
            }


            [txtQuestionThree setPlaceholder:[[appDelegate.questions objectAtIndex:2] objectForKey:@"question"]];

            appDelegate.ThridQues =[[appDelegate.questions objectAtIndex:2] objectForKey:@"question"];

            NSLog(@"current q3 %@", [[appDelegate.questions objectAtIndex:2] objectForKey:@"question"]);

            if ([[[appDelegate.questions objectAtIndex:2] objectForKey:@"permission"] isEqualToString:@"1"]) {

                ratingButton3.hidden=NO;

                ratingLabel3.hidden=NO;
            }

请帮助我，我不知道我该怎么办？

Answer 1

使用此方法获取指定字体样式的NSString的大小。并使用返回的CGSize来设置UI元素的大小，可以是label，textfield。

 (comments from apple documentation)
// Single line, no wrapping. Truncation based on the UILineBreakMode.
- (CGSize)sizeWithFont:(UIFont *)font; // Uses UILineBreakModeWordWrap
- (CGSize)sizeWithFont:(UIFont *)font forWidth:(CGFloat)width lineBreakMode:(UILineBreakMode)lineBreakMode;

// for multi lined
// Wrapping to fit horizontal and vertical size. Text will be wrapped and truncated using the UILineBreakMode. If the height is less than a line of text, it may return
// a vertical size that is bigger than the one passed in.
// If you size your text using the constrainedToSize: methods below, you should draw the text using the drawInRect: methods using the same line break mode for consistency

- (CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size; // Uses UILineBreakModeWordWrap;
- (CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size lineBreakMode:(UILineBreakMode)lineBreakMode;

例如：

NSString *valueString = @"This is example";
CGSize newSize = [valueString sizeWithFont: [UIFont fontWithName: @"TrebuchetMS" size: 12] ];

// assign new size
CGRect textFrame = textbox. frame;
textFrame. size  = newSize;

Answer 2

你试过这个吗？

CGRect frame= yourTextField.frame;
frame.size.width=your_required_width;
yourTextField.frame=frame;

Answer 3

查看this帖子

它向您展示了使用sizeWithFont，它根据文本的大小为您提供了CGSize对象。然后使用此CGSize对象的数据编辑textfields框架。

如何动态设置UITextfield宽度？

3 个答案: