Question

我试图以编程方式将UIImageView添加到我的模态视图控制器中，图像根本不会显示。我只看到白色背景。其余工作正常，因为我可以加载或关闭视图。我的代码如下：

[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor whiteColor];

UIImageView *imageView = [[[UIImageView alloc] init] initWithFrame:CGRectMake(100, 200, 100, 100)];
imageView.image = [UIImage imageNamed:@"IMG_0352.PNG"];
[self.view addSubview:imageView];


UISwipeGestureRecognizer *swipeleft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
swipeleft.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:swipeleft];

UISwipeGestureRecognizer *swiperight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
swiperight.direction = UISwipeGestureRecognizerDirectionRight;
[self.view addGestureRecognizer:swiperight];


UIBarButtonItem *dismiss_btn = [[UIBarButtonItem alloc] initWithTitle:@"Start App" style:UIBarButtonItemStylePlain target:self action:@selector(dismissModal:)];

self.navigationItem.rightBarButtonItems = [NSMutableArray arrayWithObjects:dismiss_btn, nil];

Answer 1

这一行存在一个严重的问题：

UIImageView *imageView = [[[UIImageView alloc] init] initWithFrame:CGRectMake(100, 200, 100, 100)];

需要：

UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 200, 100, 100)];

您额外拨打了init。

还要确保文件名真的命名为IMG_0352.PNG。案件很重要。确保它不是IMG_0352.png或类似的东西。

当然，请确保您确实将这样的图像打包到您的应用中。确保它列在目标的“构建阶段”的“复制包资源”部分下。

Answer 2

你需要放弃

UIImageView *imageView = [[[UIImageView alloc] init] initWithFrame:CGRectMake(100, 200, 100, 100)];

因为......好吧...... init] initWithFrame:看起来像是一个错字~~，以下是一个更好的方法来初始化UIImageView：~~

~~UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"IMG_0352.PNG"]];~~

~~ref：UIImageView only displays when I call initWithImage~~

Answer 3

imageView初始化两次。尝试删除一个init

UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 200, 100, 100)];

同时将图像添加到图像文件夹时，检查图像/文件夹是否在Xcode中添加为“创建组”选项而不是“创建文件夹参考”。文件夹引用只会提供一个链接或引用，因此您无法实际访问该文件夹中的元素。

UIImageView（以编程方式创建）未显示

3 个答案: