Question

我正在尝试使用UIPageControl创建一个UIScrollView，页面包含各种宽度的标签。问题是我不知道如何设置每个页面的宽度。

为了让自己更好地理解，这是我的代码：

：

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<UIScrollViewDelegate>

- (void)pageChangedInSecondScroll;

@end

并在.m文件中：

#import "ViewController.h"

@interface ViewController (){

    //second scroll
    UIPageControl *secondPageControl;
    UIScrollView *secondScrollView;

    //labels
    UILabel *publicLabel;
    UILabel *recentLabel;
    UILabel *favoritesLabel;
    UILabel *joinedLabel;
    UILabel *myChannelsLabel;
    UILabel *suggestedLabel;
    //Labels X positons
    int curentLabelX;
    int initialPublicLabelX;
    int initialRecentLabelX;
    int initialFavoritesX;
    int initialJoinedX;
    int initialChannelsLabelX;
    int initialSuggestedLabelX;

    //Labels aspect ratio
    int publicLabelAspectRatio;
    int recentLabelAspectRatio;
    int favoritesAspectRatio;
    int joinedAspectRatio;
    int channelsLabelAspectRatio;
    int suggestedLabelAspectRatio;
}

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.view.backgroundColor=[UIColor clearColor];

    //Scroll view for labels


    secondScrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 80.f, [[UIScreen mainScreen] bounds].size.width,23.f)];
    [secondScrollView setShowsHorizontalScrollIndicator:NO];
    secondScrollView.backgroundColor=[UIColor redColor];
    secondScrollView.delegate=self;
    secondScrollView.pagingEnabled=YES;
    [secondScrollView setContentSize:CGSizeMake(509.f, secondScrollView.frame.size.height)];



    // page control
    secondPageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(0, 0, 320, 23.f)];
    secondPageControl.backgroundColor=[UIColor blackColor];
    secondPageControl.numberOfPages=6;
    [secondPageControl addTarget:self action:@selector(pageChangedInSecondScroll) forControlEvents:UIControlEventValueChanged];
    secondPageControl.alpha = 1;

    [self.view addSubview:secondScrollView];
    [self.view addSubview:secondPageControl];

    //public label
    publicLabel = [[UILabel alloc] initWithFrame:CGRectMake(0.f, 0.f, 59.f, 23.f)];
    initialPublicLabelX = 0;
    publicLabelAspectRatio = [[UIScreen mainScreen] bounds].size.width / 64.f;
    publicLabel.backgroundColor = [UIColor redColor];
    publicLabel.text = @"public";
    [publicLabel setFont:[UIFont fontWithName:@"Helvetica-Bold" size:20]];
    publicLabel.textColor = [UIColor whiteColor];
    [secondScrollView addSubview:publicLabel];

    //recent label
    recentLabel = [[UILabel alloc] initWithFrame:CGRectMake(64.f, 0.f, 60.5f, 23.f)];
    initialRecentLabelX = 64.f;
    recentLabelAspectRatio =  [[UIScreen mainScreen] bounds].size.width / 64.f;
    NSLog(@"%d", recentLabelAspectRatio);
    recentLabel.backgroundColor = [UIColor redColor];
    recentLabel.text = @"recent";
    [recentLabel setFont:[UIFont fontWithName:@"Helvetica-Bold" size:20]];
    recentLabel.textColor = [UIColor whiteColor];
    [secondScrollView addSubview:recentLabel];

    //favorites label
    favoritesLabel = [[UILabel alloc] initWithFrame:CGRectMake(129.5f, 0.f, 83.5f, 23.f)];
    initialFavoritesX = 129.5f;
    favoritesAspectRatio =  [[UIScreen mainScreen] bounds].size.width / 65.5f;
    favoritesLabel.backgroundColor = [UIColor redColor];
    favoritesLabel.text = @"favorites";
    [favoritesLabel setFont:[UIFont fontWithName:@"Helvetica-Bold" size:20]];
    favoritesLabel.textColor = [UIColor whiteColor];
    [secondScrollView addSubview:favoritesLabel];

    //joined label
    joinedLabel = [[UILabel alloc] initWithFrame:CGRectMake(218.f, 0.f, 59.f, 23.f)];
    initialJoinedX = 218.f;
    joinedAspectRatio =  [[UIScreen mainScreen] bounds].size.width / 88.5f;
    joinedLabel.backgroundColor = [UIColor redColor];
    joinedLabel.text = @"joined";
    [joinedLabel setFont:[UIFont fontWithName:@"Helvetica-Bold" size:20]];
    joinedLabel.textColor = [UIColor whiteColor];
    [secondScrollView addSubview:joinedLabel];

    //my channels label
    myChannelsLabel = [[UILabel alloc] initWithFrame:CGRectMake(282.f, 0.f, 121.5f, 23.f)];
    initialChannelsLabelX = 282.f;
    channelsLabelAspectRatio =  [[UIScreen mainScreen] bounds].size.width / 64.f;
    myChannelsLabel.backgroundColor = [UIColor redColor];
    myChannelsLabel.text = @"my channels";
    [myChannelsLabel setFont:[UIFont fontWithName:@"Helvetica-Bold" size:20]];
    myChannelsLabel.textColor = [UIColor whiteColor];
    [secondScrollView addSubview:myChannelsLabel];


    //suggested label
    suggestedLabel = [[UILabel alloc] initWithFrame:CGRectMake(408.5f, 0.f, 100.5f, 23.f)];
    initialSuggestedLabelX = 418.5f;
    suggestedLabelAspectRatio =  [[UIScreen mainScreen] bounds].size.width / 126.5;
    suggestedLabel.backgroundColor = [UIColor redColor];
    suggestedLabel.text = @"suggested";
    [suggestedLabel setFont:[UIFont fontWithName:@"Helvetica-Bold" size:20]];
    suggestedLabel.textColor = [UIColor whiteColor];
    [secondScrollView addSubview:suggestedLabel];


}

- (void)scrollViewDidScroll:(UIScrollView *)_scrollView{

    if (_scrollView == secondScrollView) {
        NSLog(@"entered second scroll view delegate");
        if (_scrollView.contentOffset.x < 30.f) {
            secondPageControl.currentPage=0;
        }else if (_scrollView.contentOffset.x >= 30.f && _scrollView.contentOffset.x < 94.f){
            secondPageControl.currentPage=1;
        }else if (_scrollView.contentOffset.x >= 94.f && _scrollView.contentOffset.x < 172.f){
            secondPageControl.currentPage=2;
        }else if (_scrollView.contentOffset.x >= 172.f && _scrollView.contentOffset.x < 240.f){
            secondPageControl.currentPage=3;
        }else if (_scrollView.contentOffset.x >= 240.f && _scrollView.contentOffset.x < 172.f){
            secondPageControl.currentPage=4;
        }else if (_scrollView.contentOffset.x >= 344.f && _scrollView.contentOffset.x < 509.f){
            secondPageControl.currentPage=5;
        }
    }
}

- (void)pageChangedInSecondScroll{

    int pageNumber = (int)secondPageControl.currentPage;
    NSLog(@"Page number received is: %d",pageNumber);
    CGRect frame = secondScrollView.frame;


    if (pageNumber == 1) {
        frame.origin.x = 0;
    }else if (pageNumber == 2){
        frame.origin.x = 64.f;
    }else if (pageNumber == 3){
        frame.origin.x = 129.5f;
    }else if (pageNumber == 4){
        frame.origin.x = 218.f;
    }else if (pageNumber == 5){
        frame.origin.x = 282.f;
    }else if (pageNumber == 6){
        frame.origin.x = 408.5f;
    }




    frame.origin.y=0;

    [secondScrollView scrollRectToVisible:frame animated:YES];

}


- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)viewDidUnload {

    [super viewDidUnload];
}

@end

投票给所有答案！

如何更改一个UIPageControl页面的宽度

0 个答案: