If you are only actually changing a small portion of the UIView’s content every time you draw (and the rest of the content generally stays the same), you can use this. Rather than redraw all the content of the UIView every single time, you can mark only the areas of the view that need redrawing … Read more
If you’re willing to step up to iOS 4.0, the new blocks-based animation approach can make this animation chaining trivial. For example: [UIView animateWithDuration:1.0 animations:^{ view.position = CGPointMake(0.0f, 0.0f); } completion:^(BOOL finished){ [UIView animateWithDuration:0.2 animations:^{ view.alpha = 0.0; } completion:^(BOOL finished){ [view removeFromSuperview]; }]; }] will cause view to animate to (0, 0) over a … Read more
That’s the right way to go: + (UIImage *) imageWithView:(UIView *)view { UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, [[UIScreen mainScreen] scale]); [view.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage * img = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return img; } This method is an extension method for UIImage class, and it will also take care of making the image looks good on any future high-resolution devices.
The mask layer doesn’t get drawn, just used to compute the mask. Try: -(void)roundCorners:(UIRectCorner)corners radius:(CGFloat)radius { CGRect bounds = self.bounds; UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:bounds byRoundingCorners:corners cornerRadii:CGSizeMake(radius, radius)]; CAShapeLayer *maskLayer = [CAShapeLayer layer]; maskLayer.frame = bounds; maskLayer.path = maskPath.CGPath; self.layer.mask = maskLayer; CAShapeLayer* frameLayer = [CAShapeLayer layer]; frameLayer.frame = bounds; frameLayer.path = maskPath.CGPath; frameLayer.strokeColor = … Read more
Change the following line: [_window addSubview:[_navigationController view]]; to: _window.rootViewController = _navigationController; or, if you need iOS 3 compatibility: if ([_window respondsToSelector:@selector(setRootViewController:)]) { _window.rootViewController = _navigationController; } else { [_window addSubview:_navigationController.view]; }
You can connect multiple buttons to a single action without selecting them all at once. However, after creating the action, you need to save the source file containing the action before Xcode will let you connect another control to the action. I did this with Xcode 4.6.2:
In iOS 7, the keyboard uses a new, undocumented animation curve. While some have noted that using an undocumented value for the animation option works, I prefer to use the following: [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:[notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]]; [UIView setAnimationCurve:[notification.userInfo[UIKeyboardAnimationCurveUserInfoKey] unsignedIntegerValue]]; [UIView setAnimationBeginsFromCurrentState:YES]; // work [UIView commitAnimations]; While block based animations are the recommendation, the animation … Read more
A UIViewController cannot display anything; it simply coordinates the display of a UIView. So the actual pictures are going to need to be done in a UIView. In addition, your UIView is responsible for recognizing touches, gestures, etc. That’s where it ends, though; the actual reaction of your program should be up to the UIViewController. … Read more
Do you want to add unique corner value for each corner? Do you want to add a border after that? I’ve got a solution will look like this: First, add a UIBezierPath extension I made: extension UIBezierPath { convenience init(shouldRoundRect rect: CGRect, topLeftRadius: CGSize = .zero, topRightRadius: CGSize = .zero, bottomLeftRadius: CGSize = .zero, bottomRightRadius: … Read more
One thing to keep in mind is that the transform changes the coordinate system, so you will need to be able to convert between the parent ‘view’ and the child (transformed) view. Also, transforms preserve the center of the transformed object but not any of the other coordinates. So you need to calculate things in … Read more