细分的 UISegmentedControl 自定义图像

Question

有什么方法可以为 UISegmentedcontrol 中的选定段设置自定义图像并更改字体大小？

Answer 1

Use the below code in UIControlEventValueChanged event target

I'm adding the sample code.

UISegmentedControl *segmentControl = [[UISegmentedControl alloc] init];
[segmentControl addTarget:self action:@selector(segmentedControlValueChanged:) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:segmentControl];
[segmentControl release];
segmentControl = nil;


-(void)segmentedControlValueChanged:(UISegmentedControl *)selectedSegmentControl{

    int numSegments = [selectedSegmentControl.subviews count]; //getting the number of all segment sections

    //removing all segment section images.
    for( int i = 0; i < numSegments; i++ ) {

        [selectedSegmentControl setImage:nil forSegmentAtIndex:i];

    }       

    //setting image to the selected segment section.    
    [selectedSegmentControl setImage:[UIImage imageNamed:@"multiple.png"] forSegmentAtIndex:selectedSegmentControl.selectedSegmentIndex];

}

Please write down the details regarding the Font Size change . Do you wish to change only the selected segment text font size or for the all segment tabs?

Anyway, this is the common way to change the segment Font size. Please make use of it as per your conditions. You can add a comment below to get any additional help.

UIFont *myFont = [UIFont boldSystemFontOfSize:12.0f];
NSDictionary *myAttributes = [NSDictionary dictionaryWithObject:myFont
                                                       forKey:UITextAttributeFont];
[segmentedControl setTitleTextAttributes:myAttributes 
                                forState:UIControlStateNormal];

Please note that, this is only work with iOS5+

Answer 2

swift 5.x for changing Image:

  func addSegmented2(){

        let segmentedControl = UISegmentedControl(items: ["aa", "bb"])
        segmentedControl.frame = CGRect(x: 0, y: 240, width: 250, height: 30)
        self.view.addSubview(segmentedControl)
        let image = UIImage(named: "en")?.withRenderingMode(.**alwaysOriginal**)
        segmentedControl.setImage(image, forSegmentAt: 0)

    }