Question

我只想以编程方式创建一个UIImageView，在点（50,50）处显示一个20by20点。（点的图像称为draw.png）。出于某种原因，屏幕上没有显示任何内容。

继承我的代码：

- (void)viewDidLoad
{
UIImageView *dot =[[UIImageView alloc] initWithFrame:CGRectMake(50,50,20,20)];
dot.image=[UIImage imageNamed:@"draw.png"];
[self.view addSubview:dot];


[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib
}

Answer 1

首先，确保你的项目中存在draw.png并且你正在引用它（所以如果它是draw.PNG你应该放@"draw.PNG"）。此外，请在所有内容之前致电[super viewDidLoad]。

- (void)viewDidLoad
{
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib

  UIImageView *dot =[[UIImageView alloc] initWithFrame:CGRectMake(50,50,20,20)];
  dot.image=[UIImage imageNamed:@"draw.png"];
  [self.view addSubview:dot];

}

Answer 2

试试这个： -

 UIImageView *imageview = [[UIImageView alloc]
 initWithFrame:CGRectMake(50, 50, 20, 20)];
 [imageview setImage:[UIImage imageNamed:@"AppleUSA1.jpg"]];
 [imageview setContentMode:UIViewContentModeScaleAspectFit];
 [self.view addSubview:imageview];

Answer 3

此代码是正确的。确保项目中存在draw.png。您可以通过检查[UIImage imageNamed:@"draw.png"]是否未返回nil来执行此操作。

另外，请确保图像视图顶部没有其他视图。

Answer 4

确保图片在您的项目中..

UIImageView *imgView=[[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 50, 50)];
[imgView setImage:[UIImage imageNamed:@"xyz.jpg"]];//if your images extension is .png than no need to write extension of an image..
[self.view addSubview:imgView];

Answer 5

在斯威夫特：

   let imageView = UIImageView(frame: CGRect(x: 50, y: 50, width: 20, height: 20))
     imageView.image = UIImage(named: "draw.png")
     self.view.addSubview(imageView)

Answer 6

此代码与UIImageView完美匹配：

UIImageView *IMG_view= [[UIImageView alloc] initWithFrame:CGRectMake(20 ,50 ,40 ,40)];
[IMG_view setTag:100]; //[IMG_view setTag:indexPath.row];
IMG_view.layer.borderWidth= 0.5 ;
IMG_view.layer.borderColor= [[UIColor clearColor] CGColor];
IMG_view.layer.cornerRadius= 3;
IMG_view.contentMode = UIViewContentModeScaleAspectFit;
[self.view addSubview:IMG_view];
IMG_view.image=[UIImage imageNamed:@"Loading_50x50.png"];

如何在Xcode中以编程方式创建UIImageView

6 个答案: