Black view is comming while hiding a keyboard - ios

Question

Here is the some piece of code I written for moving textview when user start typing in textview.
Here is the code,
-(BOOL)textViewShouldBeginEditing:(UITextView *)textView{
if(textView == _textViewMsg || textView == _subjectView ){
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
// return YES;
}
return YES;
}
- (BOOL)textViewShouldEndEditing:(UITextView *)textView{
if(textView == _textViewMsg || textView == _subjectView ){
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:nil];
[self.view endEditing:YES];
}
return YES;
}
- (void)keyboardDidShow:(NSNotification *)notification
{
[self.view setFrame:CGRectMake(0,-50,320,460)];
}
-(void)keyboardDidHide:(NSNotification *)notification
{
[self.view setFrame:CGRectMake(0,60,320,520)];
}
When I click on textview (in Subject) view in moving and I am able to type in textview. It is working fine. (Image 1)
When I click on done button, while hiding i.e at the time of keyboard hide one black view is coming (check Image 2) for few seconds, and then again normal view come.
Edit:
Solution : #michael gives me solution just now
changing UIKeyboardDidHideNotification to UIKeyboardWillHideNotification it works for me.
New Problem Occurred :
When I start typing in first 2 textviews i.e Requester, firstname & lastname...I am not able to type in it, because it is moving up.

Answer 1

It happened because you changing frame of your view after keyboard did disappear, when system animation is completed. Quick fix: change UIKeyboardDidHideNotification to UIKeyboardWillHideNotification
But I want to point few other items in you code, if you don't mind.
1:
You are subscribing for notifications each time user begin editing. It means that when user start typing second time, you code will be triggered twice. It is much more more appropriate to subscribe for notifications on viewDidAppear and unsubscribe on viewWillDisappear:
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear: animated];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(keyboardWillHide:) name:UIKeyboardDidHideNotification object:nil];
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
2:
Then you changing your frame to constant value. But now apple support different keyboards with different size not to mention that keyboards size vary on different devices and in different possible modes. So it is much more wise to get the size of keyboard from notification:
- (void)keyboardDidShow:(NSNotification *)aNotification
{
CGRect keyboardFrame = [[aNotification.userInfo valueForKey: UIKeyboardFrameEndUserInfoKey] CGRectValue];
CGRect overlap = CGRectIntersection( self.view.frame, keyboardFrame);
// Setup new frmae according to overlap, for example reduce size by half of overlap, and move up by another half
CGRect newFrame = self.view.frame;
newFrame.origin.y -= overlap.size.height / 2.0
newFrame.size.height -= overlap.size.height / 2.0
self.view.frame = newFrame;
}
3:
Animations: You can fetch keyboard animation duration from notification as well:
UIKeyboardAnimationDurationUserInfoKey:
NSTimeInterval duration = [[aNotification.userInfo valueForKey: UIKeyboardAnimationDurationUserInfoKey] doubleValue];
[UIView animateWithDuration:duration animations:^{
self.view.frame = newFrame;
}];
4
As it seems your working with scroll view (UITableView and UICollectioView are scroll view), you can instead of changing frame, change content inset (add empty space to bottom scroll view)
[self.view setContentInset:UIEdgeInsetsMake(0, 0, overlap.size.height, 0)];
5
Consider using AutoLayout.

Answer 2

adding observers should be there in viewdidload. try moving the code of adding observers for keyboard to viewdidload.
Edit
Instead of did... notification type check with will...
so replace UIKeyboardDidShowNotification with UIKeyboardWillShow and UIKeyboardDidHideNotification with UIKeyboardWillHide.

Answer 3

Use of IQKeyboardManager framework will help to handle keyboard hide and unhide issues,
Most efficient way for keyboard handling: IQKeyboardManager
Method 1:
You can use a Cocoa Pod file for IQKeyboardManager Library.
init the pod file.
pod 'IQKeyboardManager'
install Pod file.
Method 2:
Download IQKeyboardManger SDK from github and drag & drop inside your project file.
Swift code snippet:
import IQKeyboardManagerSwift
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
IQKeyboardManager.sharedManager().enable = true
return true
}
}
Objective-C Snippet:
#import <IQKeyboardManager/IQKeyboardManager.h>
#implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
//ONE LINE OF CODE.
//Enabling keyboard manager(Use this line to enable managing distance between keyboard & textField/textView).
[[IQKeyboardManager sharedManager] setEnable:YES];
return true;
}
Hope this will help you to resolve your keyboard hide and unhide UI issues.