テキスト ビューを使用してテキストを編集できる単純なモーダル ビュー コントローラーを作成しようとしています。ただし、View Controller をモーダルに表示すると、下からスライドするのではなく、左下方向からスライドします。
これは奇妙な効果のビデオです: http://youtu.be/9M_MHA5mt1M
私のコントローラーは、キーボードが表示されるのを監視し、自動レイアウトを使用してテキストビューのサイズを適切に変更します。コードは次のとおりです。
#import "TextPicker.h"
@interface TextPicker ()
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *keyboardHeight;
@end
@implementation TextPicker
- (id)initWithText:(NSString *)text
{
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard_iPhone" bundle:nil];
self = [storyboard instantiateViewControllerWithIdentifier:@"textPicker"];
if (self) {
self.text = text;
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self observeKeyboard];
//self.textView.text = self.text;
[self.textView becomeFirstResponder];
}
- (void) viewWillDisappear:(BOOL)animated {
[self.textView resignFirstResponder];
}
- (IBAction)savePressed:(id)sender {
[self dismissViewControllerAnimated:YES completion:nil];
}
- (IBAction)cancelPressed:(id)sender {
[self dismissViewControllerAnimated:YES completion:nil];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (void) dealloc {
[self stopObervingKeyboard];
}
- (void)observeKeyboard {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillChangeFrameNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}
- (void)stopObervingKeyboard {
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillChangeFrameNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}
- (void)keyboardWillShow:(NSNotification *)notification {
NSDictionary *info = [notification userInfo];
NSValue *kbFrame = [info objectForKey:UIKeyboardFrameEndUserInfoKey];
CGRect keyboardFrame = [kbFrame CGRectValue];
self.keyboardHeight.constant = -keyboardFrame.size.height;
NSTimeInterval animationDuration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
[UIView animateWithDuration:animationDuration animations:^{
[self.view layoutIfNeeded];
}];
}
- (void)keyboardWillHide:(NSNotification *)notification {
NSDictionary *info = [notification userInfo];
NSTimeInterval animationDuration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
self.keyboardHeight.constant = 0;
[UIView animateWithDuration:animationDuration animations:^{
[self.view layoutIfNeeded];
}];
}
- (IBAction)dismissKeyboard:(id)sender {
[self.textView resignFirstResponder];
}
@end