以编程方式将 UILabels 和 UIImageViews 添加到 UIScrollView

我知道这个问题在这里经常出现，但我似乎仍然无法让它发挥作用。我可能没有正确启动视图或其他...无论如何，我正在尝试以编程方式向 UIScrollView 添加多个标签和图像。这是我的 .h 文件的代码：

#import <UIKit/UIKit.h>

@interface DOR_HelpViewController : UIViewController <UIScrollViewDelegate> {
    IBOutlet UIScrollView *scrollView;
}

@property (nonatomic, retain) IBOutlet UIScrollView *scrollView;

@end

我的 .m 文件：

#import "DOR_HelpViewController.h"

@implementation DOR_HelpViewController

@synthesize scrollView;

- (void)viewWillAppear:(BOOL)animated {     

    [super viewWillAppear:animated];

    scrollView = [[UIScrollView alloc] init];

    UILabel *pointsCouponLbl = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 20.0, 320.0, 15.0)];
    pointsCouponLbl.font = [UIFont boldSystemFontOfSize:14.0];
    pointsCouponLbl.textAlignment = UITextAlignmentCenter;
    pointsCouponLbl.textColor = [UIColor blackColor];
    pointsCouponLbl.backgroundColor = [UIColor clearColor];
    pointsCouponLbl.text = @"Points Earned Using a Coupon";
    [scrollView addSubview:pointsCouponLbl];

    UIImageView *pointsCouponImg = [[UIImageView alloc] initWithFrame:CGRectMake(72, 45, 175, 100)];
    pointsCouponImg.image = [UIImage imageNamed:@"couponpoints.png"];
    [scrollView addSubview:pointsCouponImg];

    UILabel *pointsCheckInLbl = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 165.0, 320.0, 15.0)];
    pointsCheckInLbl.font = [UIFont boldSystemFontOfSize:14.0];
    pointsCheckInLbl.textAlignment = UITextAlignmentCenter;
    pointsCheckInLbl.textColor = [UIColor blackColor];
    pointsCheckInLbl.backgroundColor = [UIColor clearColor];
    pointsCheckInLbl.text = @"Points Earned For Check-In";
    [scrollView addSubview:pointsCheckInLbl];
    pointsCheckInLbl = nil;

    UIImageView *pointsCheckInImg = [[UIImageView alloc] initWithFrame:CGRectMake(72, 190, 175, 100)];
    pointsCheckInImg.image = [UIImage imageNamed:@"checkinpoints.png"];
    [scrollView addSubview:pointsCheckInImg];
    pointsCheckInImg = nil;
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

#pragma mark - View lifecycle

- (void)viewDidUnload
{
    [super viewDidUnload];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end

scrollView链接到我的UIScrollView我的故事板中的对象。如果您不介意的话，我将非常感谢有关我做错了什么以及原因的信息。先谢谢啦~

Remove scrollView = [[UIScrollView alloc] init];与 IB 合作时没有必要（甚至适得其反）。

（实际上这只是评论中的一个想法 - 见上文。但我尝试尽可能赢得声誉;-)）