Easy way to handle iOS keyboard showing/dismissing.
Working with iOS keyboard demands a lot of duplicated code. This category allows you to declare your animations with smooth keyboard animation timing and write very little code.
Try it yourself
pod try UIViewController+KeyboardAnimation
Imagine that you need to implement chat-like input over keyboard. OK, import this category.
#import <UIViewController+KeyboardAnimation.h>
Then make autolayout constraint between your input bottom and superview botton in Interface Builder, connect it with your view controller implementation through IBOutlet.
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *chatInputBottomSpace;
Then subscribe to keyboard in place you like (viewWillAppear is the best place really).
@weakify(self)
[self an_subscribeKeyboardWithAnimations:^(CGRect keyboardRect, NSTimeInterval duration, BOOL isShowing) {
@strongify(self)
self.chatInputBottomSpace.constant = isShowing ? CGRectGetHeight(keyboardRect) : 0;
[self.view layoutIfNeeded];
} completion:nil];
That’s all!
Don’t forget to unsubscribe from keyboard events (viewWillDisappear is a my recommendation). Calling category method will do all “dirty” work for you.
[self an_unsubscribeKeyboard];
For more complex behaviour (like in demo section) you can use extended API call with before animation section.
@weakify(self)
[self an_subscribeKeyboardWithBeforeAnimations:^(CGRect keyboardRect, NSTimeInterval duration, BOOL isShowing) {
@strongify(self)
self.isKeaboardAnimation = YES;
[UIView transitionWithView:self.imageView duration:duration options:UIViewAnimationOptionTransitionCrossDissolve animations:^{
if (isShowing) {
self.imageView.image = [self.imageView.image applyLightEffect];
} else {
[self.imageView hnk_setImageFromURL:self.model.cardImageUrl];
}
} completion:nil];
} animations:^(CGRect keyboardRect, NSTimeInterval duration, BOOL isShowing) {
@strongify(self)
self.headerHeight.constant = isShowing ? kHeaderMinHeight :kHeaderMaxHeight;
self.panelSpace.constant = isShowing ? CGRectGetHeight(keyboardRect) : 0;
for (UIView* v in self.headerAlphaViews) {
v.alpha = isShowing ? 0.0f : 1.0f;
}
[self.view layoutIfNeeded];
} completion:^(BOOL finished) {
@strongify(self)
self.isKeaboardAnimation = NO;
}];
This category registers/unregisters your view controller to UIKeyboardWillShowNotification/UIKeyboardWillHideNotification. Also it holds animation blocks, so you really need to provide weak reference to self (i use @weakify/@strongify from ReactiveCocoa dependency).
Add the following to your CocoaPods Podfile
pod 'UIViewController+KeyboardAnimation', '~> 1.2'
or clone as a git submodule,
or just copy files
All this code is available under the MIT license.
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Simple category to show loading status in a navigation bar (left/right items or title) UINavigationItem-Loading