如何調整文本（字體）的大小以適應 UISegmentedControl 的 UISegment？

Question

有什么方法可以減少可以適合UISegmentedControl單段的字體大小嗎？

嘗試過很多事情，比如

[[UILabel appearanceWhenContainedIn:[UISegmentedControl class], nil] adjustsFontSizeToFitWidth];

[[UILabel appearanceWhenContainedIn:[UISegmentedControl class], nil] setMinimumScaleFactor:0.5];

和

 NSArray *arr = segment.subviews;  // segment is UISegmentedControl object

for (int i = 0; i < arr.count; i++) {

    UIView *aSegment = [arr objectAtIndex:i];

    for (UILabel *label in aSegment.subviews) {

        if ([label isKindOfClass:[UILabel class]]) {

            UILabel *myLabel = (UILabel *)label;

            [myLabel setNumberOfLines:0];

            label.numberOfLines = 0;
            label.adjustsFontSizeToFitWidth = YES;
            label.minimumScaleFactor = 0.5;
        }



    }
}

能夠設置段標簽的行數，例如，

  [[UILabel appearanceWhenContainedIn:[UISegmentedControl class], nil] setNumberOfLines:0];

可以根據內容設置單段大小，例如，

  segment.apportionsSegmentWidthsByContent = YES;

但在這種情況下，每個段都有不同的大小。

我想保持每一段相同的大小和要減少字體大小可以適合於UISegmentLabel (label)的UISegmentedControl像minimumscalefactor或minimumfontsize或adjustsFontSizeToFitWidth 。 當包含在UISegmentedControl時，這些屬性不適用於標簽。

如果有人可以幫助實現這一目標，將不勝感激！！

提前致謝！！

Answer 1

我發現了問題，其實是我的錯誤！！！ 我正在設置numberOfLines,adjustsFontSizeToFitWidth,minimumScaleFactor和TitleTextAttributes 。 如果我們設置titleTextAttribute那么minimumScaleFactor就不能工作。

更新：（如@HawkEye1194 在另一個答案的評論中所問）

我最終得到了以下解決方案，

 //this will allow multiple lines in label contained by every segment in segmentedcontroller

[[UILabel appearanceWhenContainedIn:[UISegmentedControl class], nil] setNumberOfLines:0];


UISegmentedControl *segment = [[UISegmentedControl alloc]initWithItems:option];
segment.frame = CGRectMake(20, 50, self.view.frame.size.width - 40, 50);
segment.tintColor = [UIColor grayColor];
segment.selectedSegmentIndex = 0;
segment.backgroundColor = [UIColor whiteColor];
segment.tag = segmentedControllerBaseTag;


[segment addTarget:self action:@selector(segmentChanged:) forControlEvents:UIControlEventValueChanged];

[segment setTitleTextAttributes:@{NSFontAttributeName :[UIFont fontWithName:@"HelveticaNeue" size:17.0], NSForegroundColorAttributeName : [UIColor darkGrayColor] } forState:UIControlStateNormal];
[segment setTitleTextAttributes:@{NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue" size:17.0],NSForegroundColorAttributeName : [UIColor whiteColor]} forState:UIControlStateSelected];

如果你沒有像上面那樣設置標題文本屬性，那么你可以使用下面的代碼

// ********** if titletextattributes are not set then below method works ***********

   for(uint i=0;i<[segment subviews].count;i++)
   {
    for(UIView *view in [[[segment subviews] objectAtIndex:i] subviews])
    {
        if([view isKindOfClass:[UILabel class]])
        {

            [(UILabel*)view setNumberOfLines:0];
            [(UILabel*)view setAdjustsFontSizeToFitWidth:YES];
            [(UILabel*)view setMinimumScaleFactor:0.7];


        }
    }
}

您可以通過以下代碼根據其內容調整單個段的大小，

 //*************** adjust single segment size as per content

 segment.apportionsSegmentWidthsByContent = YES;

Answer 2

試試這個，我希望這會幫助你，你會知道這是如何工作的 -

我有一個UISegmentedControl即_userProfileSagmentOutlet具有三個段。 這是示例代碼-

CGFloat fontSize = 15;

[_userProfileSagmentOutlet setTitleTextAttributes:@{NSFontAttributeName:[UIFont fontWithName:@"Roboto-medium" size:fontSize],
                                                    NSForegroundColorAttributeName:[UIColor whiteColor]}
                                         forState:UIControlStateSelected];

[_userProfileSagmentOutlet setTitleTextAttributes:@{NSFontAttributeName:[UIFont fontWithName:@"Roboto-medium" size:fontSize],
                                                    NSForegroundColorAttributeName:[UIColor whiteColor]}
                                         forState:UIControlStateNormal];

這是前面的代碼，它截斷標題的尾部，如下圖所示-

這是在具有相同字體大小的段中適合每個標題的主要邏輯-

CGFloat fontSize = 15;

NSAttributedString* firstTitle = [[NSAttributedString alloc] initWithString:@"Membership History" attributes:@{NSFontAttributeName: [UIFont fontWithName:@"Roboto-medium" size:fontSize]}];

NSAttributedString* secondTitle = [[NSAttributedString alloc] initWithString:@"Event History" attributes:@{NSFontAttributeName: [UIFont fontWithName:@"Roboto-medium" size:fontSize]}];

NSAttributedString* thirdTitle = [[NSAttributedString alloc] initWithString:@"Booked Classes" attributes:@{NSFontAttributeName: [UIFont fontWithName:@"Roboto-medium" size:fontSize]}];


float maxW=MAX(MAX(firstTitle.size.width, secondTitle.size.width), thirdTitle.size.width);

while (maxW > _userProfileSagmentOutlet.subviews[0].frame.size.width) {

    fontSize--;

    firstTitle = [[NSAttributedString alloc] initWithString:@"Membership History" attributes:@{NSFontAttributeName: [UIFont fontWithName:@"Roboto-medium" size:fontSize]}];

    secondTitle = [[NSAttributedString alloc] initWithString:@"Event History" attributes:@{NSFontAttributeName: [UIFont fontWithName:@"Roboto-medium" size:fontSize]}];

    thirdTitle = [[NSAttributedString alloc] initWithString:@"Booked Classes" attributes:@{NSFontAttributeName: [UIFont fontWithName:@"Roboto-medium" size:fontSize]}];

    maxW=MAX(MAX(firstTitle.size.width, secondTitle.size.width), thirdTitle.size.width);


}
[_userProfileSagmentOutlet setTitleTextAttributes:@{NSFontAttributeName:[UIFont fontWithName:@"Roboto-medium" size:fontSize],
                                                    NSForegroundColorAttributeName:[UIColor whiteColor]}
                                         forState:UIControlStateSelected];

[_userProfileSagmentOutlet setTitleTextAttributes:@{NSFontAttributeName:[UIFont fontWithName:@"Roboto-medium" size:fontSize],
                                                    NSForegroundColorAttributeName:[UIColor whiteColor]}
                                         forState:UIControlStateNormal];

使用此代碼圖像后看起來像這樣（相同的字體大小和文本適合分段並且工作正常）-

如果有人需要，這里是 Swift 擴展 -

    var fontSize:CGFloat = 15.0;

    var firstTitle = NSMutableAttributedString.init(string: "Membership History", attributes:[NSFontAttributeName: UIFont.systemFontOfSize(fontSize)])

    var secondTitle = NSMutableAttributedString.init(string: "Events History" ,attributes:[NSFontAttributeName: UIFont.systemFontOfSize(fontSize)]);

    var thirdTitle = NSMutableAttributedString.init(string: "Booked Classes" ,attributes:[NSFontAttributeName: UIFont.systemFontOfSize(fontSize)]);

    var maxW:CGFloat = max(max(firstTitle.size().width, secondTitle.size().width), thirdTitle.size().width);

    while (maxW > userProfileSagmentOutlet.subviews[0].frame.size.width) {

        fontSize--;

         firstTitle = NSMutableAttributedString.init(string: "Membership History", attributes:[NSFontAttributeName: UIFont.systemFontOfSize(fontSize)])

         secondTitle = NSMutableAttributedString.init(string: "Events History" ,attributes:[NSFontAttributeName: UIFont.systemFontOfSize(fontSize)]);

         thirdTitle = NSMutableAttributedString.init(string: "Booked Classes" ,attributes:[NSFontAttributeName: UIFont.systemFontOfSize(fontSize)]);

         maxW = max(max(firstTitle.size().width, secondTitle.size().width), thirdTitle.size().width);

    }
    userProfileSagmentOutlet.setTitleTextAttributes([NSFontAttributeName: UIFont.systemFontOfSize(fontSize),NSForegroundColorAttributeName:UIColor.whiteColor()], forState:UIControlState.Normal)

    userProfileSagmentOutlet.setTitleTextAttributes([NSFontAttributeName: UIFont.systemFontOfSize(fontSize),NSForegroundColorAttributeName:UIColor.whiteColor()], forState:UIControlState.Selected)

Answer 3

快速 4

標簽中允許多行

if #available(iOS 9.0, *) {
    UILabel.appearance(whenContainedInInstancesOf: [UISegmentedControl.self]).numberOfLines = 0
}

Answer 4

我在視圖控制器中運行它，並在 viewDidAppear 之后調用它

func autoshrinkSegmentFontSize() {
    for subview in segments.subviews {
        for label in subview.subviews {
            if let myLabel = subview as? UILabel {
                myLabel.adjustsFontSizeToFitWidth = true
                myLabel.minimumScaleFactor = 0.5
            }
        }
    }
}

Answer 5

現代 Swift 中最簡單的解決方案是

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
        
    _ = Your_UISegmentControl.subviews.compactMap { $0.subviews.compactMap {
        ($0 as? UILabel)?.adjustsFontSizeToFitWidth = true
        ($0 as? UILabel)?.minimumScaleFactor = 0.5
    }}
}