标签: uiimageview

好吧我想添加一个UIImageView作为子视图,然后在启动画面工作的几秒钟后删除它.我找到了三种不同的方法,但根据Objective-C和Apple,我无法理解哪种方法是最好的方法.

以下是三种不同的方法:

1)在我的MyAppDelegate.h中

@interface MyAppDelegate : NSObject <UIApplicationDelegate> {

    MyViewController *myViewController;
    UIImageView *myImageView;
}


@property (nonatomic, retain) IBOutlet MyViewController *myViewController;
@property (nonatomic, retain) IBOutlet UIWindow *window;

@end

在MyAppDelegate.m中

   - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    myImageView =[[UIImageView alloc] initWithFrame:CGRectMake(0.0,0.0,self.window.frame.size.width,self.window.frame.size.height)];

        myImageView.image=[UIImage imageNamed:@"Yoga.png"];


    [self.window addSubview:myImageView ];
    [self.window bringSubviewToFront:myImageView];

    [self performSelector:@selector(removeImage) withObject:nil afterDelay:2.5];

    return YES;
}

-(void) removeImage
{
    [myImageView removeFromSuperview];

    [myImageView release];

    [self.window addSubview:myViewController.view];
    [self.window makeKeyAndVisible];
}

2)在第二种方法中:

In my MyAppDelegate.h


@interface MyAppDelegate : NSObject <UIApplicationDelegate> {

    MyViewController *myViewController;
    UIImageView *myImageView;
}

@property …

我对如何做我需要的东西感到很困惑!任何帮助非常感谢!我有一个透明的图像叠加层,后面有另一个图像,它附有一个UIPanGestureRecognizer和一个UIPinchGestureRecognizer.顶部图像具有完全透明的中间,用作"玻璃"视图.我试图将底部图像裁剪为基于平移和捏合的"玻璃"部分.(见下面的图片,看看我在说什么)我已经成功地处理了平底锅作物,但是在应用捏合时也有问题正确裁剪.

我没有使用snapshotViewAfterScreenUpdates.

这是我到目前为止的代码:

 UIImage *snapshotImage;

/* draw the image of all the views below our view */
UIGraphicsBeginImageContextWithOptions(self.pendantImageView.bounds.size, NO, 0);
BOOL successfulDrawHierarchy = [self.pendantImageView drawViewHierarchyInRect:self.pendantImageView.bounds afterScreenUpdates:YES];
if ( successfulDrawHierarchy ) {
    snapshotImage = UIGraphicsGetImageFromCurrentImageContext();
} else {
    NSLog(@"drawViewHierarchyInRect:afterScreenUpdates: failed - there's nothing to draw...");
}
UIGraphicsEndImageContext();
UIImage *croppedImage;
if ( successfulDrawHierarchy ) {

    /* calculate the coordinates of the rectangle we're interested in within the returned image */
    CGRect cropRect = CGRectOffset(pendantFrame, - self.pendantImageView.frame.origin.x, - self.pendantImageView.frame.origin.y);

    /* draw the cropped …

理想情况下,NSCoding兼容类将使用encodeWithCoder:和initWithCoder按预期工作:(至少我认为直到最近),开发人员不必担心例程内部的内容(除非我对NSCoding兼容类的想法完全搞砸了) !)

UIImageView类符合NSCoding.所以我不应该打扰如何使用NSKeyedArchiver和NSKeyedUnarchiver类对它进行序列化/反序列化.但每次我尝试编码UIImageView对象时,都会收到UIImage无法识别的错误:encodeWithCoder:method.

现在UIImageView内部使用UIImage对象.但编码是否应该自己处理？

或者文档中指定的NSCoding合规性是否让用户知道他们可以实现initWithCoder和encodeWithCoder方法？

有人可以帮我澄清一下!我很困惑!

我有一个图像数组加载到UIImageView中,我通过一个循环动画.显示图像后,我想@selector调用一个以关闭当前视图控制器.使用以下代码可以很好地动画图像:

NSArray * imageArray = [[NSArray alloc] initWithObjects:
                        [UIImage imageNamed:@"HowTo1.png"], 
                        [UIImage imageNamed:@"HowTo2.png"],
                        nil];
UIImageView * instructions = [[UIImageView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

instructions.animationImages = imageArray;
[imageArray release];
instructions.animationDuration = 16.0;
instructions.animationRepeatCount = 1;
instructions.contentMode = UIViewContentModeBottomLeft;
[instructions startAnimating];
[self.view addSubview:instructions];
[instructions release];

16秒后,我想要一个方法来调用.我查看了UIView类方法,setAnimationDidStopSelector:但我无法使用它来处理当前的动画实现.有什么建议？

谢谢.

在我的应用程序中,我UITextView在文本视图下方有一个按钮,可以UITextView在编辑时插入照片.

我的要求是用户用户能够在其中编辑文本,并在需要时插入图像.

与StackOverflow的应用程序类似UITextView:

如何通过在手指上滑动来擦除前面UIImage上的内容并显示UIView背面的UIImage.

我曾使用以下代码- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 擦除前图像:

-(void)eraseDrawingContents
{
    UIGraphicsBeginImageContext(frontImage.frame.size);
    [frontImage.image drawInRect:CGRectMake(0, 0, frontImage.frame.size.width, frontImage.frame.size.height)];

    CGContextSaveGState(UIGraphicsGetCurrentContext());
    CGContextSetShouldAntialias(UIGraphicsGetCurrentContext(), YES);
    CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 25.0);
    CGContextSetShadowWithColor(UIGraphicsGetCurrentContext(), CGSizeMake(0, 0), 50, [[UIColor whiteColor]CGColor]);

    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, nil, lastPoint.x, lastPoint.y);
    CGPathAddLineToPoint(path, nil, currentPoint.x, currentPoint.y);
    CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeClear);
    CGContextAddPath(UIGraphicsGetCurrentContext(), path);
    CGContextStrokePath(UIGraphicsGetCurrentContext());

    frontImage.image = UIGraphicsGetImageFromCurrentImageContext();
    CGContextRestoreGState(UIGraphicsGetCurrentContext());
    UIGraphicsEndImageContext();

    lastPoint = currentPoint;
}

我实现了以下输出.

但我需要像这样的输出.

我们如何实现这一功能？

请帮我.

我有一个目标动作,当按下按钮时,我验证UITextField:

// Get the text from the UITextField
NSString *nameStr = _name.text;

_name.rightView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"error.png"]];
[self.view addSubview:_name];

if (nameStr.length == 0)
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Invalid Name"
                                                    message:@"You must enter a name."
                                               delegate:nil
                                          cancelButtonTitle:@"OK"
                                          otherButtonTitles:nil];
    [alert show];
}

我UITextField被添加到视图中,viewDidLoad如下所示:

[self.view addSubview:_name];

如何UIImageView显示rightView ？

我正在编写一个应用程序iOS 7.0+,我想使用新功能imageWithRenderingMode.我有一个使用此代码的地图注释:

-(MKAnnotationView*)annotationView {
    MKAnnotationView *annotationView = [[MKAnnotationView alloc] initWithAnnotation:self reuseIdentifier:@"AnnotationIdentifier"];
    annotationView.enabled = YES;
    annotationView.canShowCallout = YES;
    annotationView.image = [[UIImage imageNamed:@"star"] imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
    annotationView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    annotationView.tintColor = [UIColor redColor];
    return annotationView;
}

我原本以为我的针脚是红色的,但是保持黑色,只有标注(i)图标变成红色.

我试图设置self.view.tintColor和self.mapView.tintColor我的,ViewController但这也不起作用.如何将此引脚变为红色？

我正在尝试将用户上传的图像从一个UIImageView移动到另一个View Controller上的另一个UIImageView.我可以让用户上传图像并将其保存在第一个UIImageView中,但在按下"发布"按钮后,下一个视图控制器上的UIImageView仍为空白.

注意:browsingImage是第二个视图控制器上的UIImageView的名称(目标UIImageView)

任何帮助将不胜感激!

@IBAction func cameraButton(sender: AnyObject) {

    addNewPicture()

}


func addNewPicture() {

    let picker = UIImagePickerController()
    picker.allowsEditing = true
    picker.delegate = self

    presentViewController(picker, animated: true, completion: nil)
}

func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {

    postingImage.image = image
    self.dismissViewControllerAnimated(true, completion: nil)

}

@IBAction func postButton(sender: AnyObject) {

    performSegueWithIdentifier("toBrowsePage", sender: nil)


}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

    if segue.identifier == "toBrowsePage" {


        var itemToAdd = segue.destinationViewController as! …

启用接近传感器时,我无法让设备使用后视摄像头拍摄图像.我不希望相机预览显示,只是希望设备拍摄照片并将其显示在imageView中.我有接近传感器工作,我正在使用接近传感器启用imagePicker.takePicture()时拍摄图像,但这似乎不起作用.我可以使用什么方法/函数以编程方式拍摄没有用户输入的图片.

到目前为止这是我的代码:

class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {

@IBOutlet var imageView: UIImageView!

var imagePicker: UIImagePickerController!

//*The function in question*  
func proximityChanged(notification: NSNotification) {
    let device = notification.object as? UIDevice
    if device?.proximityState == true {
        print("\(device) detected!")