uiviewanimation

问题 How do you pause and resume UIView Animations? (without block animations) I was having the hardest time figuring this out, so here is my source below on how to do it. 回答1: How to pause and resume UIView Animations: This will cover how to do the above without block animations. (People do still wish to support 3.0 and up). This only allows for pausing once the animation has met the set location. For how to pause an animation in the middle of an animation, i suggest using CALayers as such:

问题 I am using iOS 7 and I am trying to move a label that is centered off to the left of my view. Currently I am trying to do this by changing how my UILabel is aligned, and I am trying to animate it in the process. I am currently calling the following: [UIView animateWithDuration:0.5 animations:^{ self.monthLabel.textAlignment = NSTextAlignmentLeft; } completion:nil]; But this just jumps the label to the new alignment. Is there a way to animate this, or a better way to adjust the label to make

问题 I am using iOS 7 and I am trying to move a label that is centered off to the left of my view. Currently I am trying to do this by changing how my UILabel is aligned, and I am trying to animate it in the process. I am currently calling the following: [UIView animateWithDuration:0.5 animations:^{ self.monthLabel.textAlignment = NSTextAlignmentLeft; } completion:nil]; But this just jumps the label to the new alignment. Is there a way to animate this, or a better way to adjust the label to make

问题 I have a UIview Containing two UIButtons. -(void)ViewDidLoad { geopointView = [[UIView alloc] initWithFrame:CGRectMake(0, 350, 120, 80)]; geopointView.backgroundColor = [UIColor greenColor]; UIButton *showGeoPointButton = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain]; showGeoPointButton.frame = CGRectMake(0, 0, 120, 40); showGeoPointButton.titleLabel.font = [UIFont systemFontOfSize:13.0]; [showGeoPointButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

问题 I am trying to use a custom segue to perform a kind of zoom animation. When the transition is executed, the sourceViewController goes black, then the zoom occurs. Tried also to set the pushViewController: into the completion block but the transition is not executed at all. - (void)perform { UIViewController *sourceViewController = (UIViewController *) self.sourceViewController; UIViewController *destinationViewController = (UIViewController *) self.destinationViewController;

问题 I'm looking for a way to animate the drawing of a circle. I have been able to create the circle, but it draws it all together. Here is my CircleView class: import UIKit class CircleView: UIView { override init(frame: CGRect) { super.init(frame: frame) self.backgroundColor = UIColor.clearColor() } required init(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented") } override func drawRect(rect: CGRect) { // Get the Graphics Context var context =

问题 I am attempting to make an image view ( logo below) slide upwards by 100 pixels. I am using this code, but nothing happens at all: [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:3]; logo.center = CGPointMake(logo.center.x, logo.center.y - 100); [UIView commitAnimations]; This code is in the viewDidLoad method. Specifically, the logo.center = ... is not functioning. Other things (like changing the alpha) do. Maybe I'm not using the right code to slide it upwards? 回答1:

问题 I am almost towards the last phase of my app, which shows a live map of buses. So, basically, I have a timer which gets the latitude and longitude of a bus periodically from a xml sheet which provides real-time locations of the buses. I was able to setup the xml parser, animate the buses' movement and setup a custom (arrow) image for the buses. However, the problem is, from an array of multiple buses, I can only get a single bus to rotate . Looking at the xml data, it's always the first bus

问题 I have added UILongPressGestureRecognizer to a view, and after long press event, the user can drag the view. I have added a view on the key window (need the custom view over the navigation and tab bar controllers, that is why need to add it on key window) using below code: // add the custom view on the key window. UIWindow *currentWindow = [UIApplication sharedApplication].keyWindow; [currentWindow addSubview:customView]; Now, when I am dragging the first view beyond the (screenSize/2) point,

问题 I have a UIView animation (called by a touchesEnded: event) that I want to finish executing before more user input is allowed. Before the animation is called, I inspect a flag " isMoving " to see if the animation is in progress. I then set isMoving to YES and execute the animation as follows (yes, I know it's not in block format)... - (void) methodCalledFromViewControllerTouchesEnded { if (isMoving == YES) { NSLog (@"Don't start another animation!"); return; } isMoving = YES; ...... [UIView