objective-c : making UITextView programmatically with custom class and UITextViewDelegate (JTextView)

making UITextView programmatically with custom class and UITextViewDelegate (JTextView).m

//making UITextView programmatically with custom class and UITextViewDelegate (JTextView)


//1. make basic UITextView programmatically with custom class


//Prefix header

#ifdef __OBJC__
    #define debug 1
    #define kSTATUSBAR_OFFSET 20.0 // 스테이터스 바 높이
    #define kINSET_TOP 10.0 // 텍스트 뷰 인셋 top
    #define kINSET_LEFT 10.0 // 텍스트 뷰 인셋 left
    #define kINSET_BOTTOM 10.0 // 텍스트 뷰 인셋 bottom
    #define kINSET_RIGHT 10.0 // 텍스트 뷰 인셋 right
#endif





//JTextView.h

@interface JTextView : UITextView

- (void)updateNoteTextViewFrame;
- (void)keyboardDidShow:(NSNotification *)notification;
- (void)keyboardWillHide:(NSNotification*)notification;

@end



//JTextView.m

@implementation JTextView
{
    CGRect _applicationFrame;
    CGSize _keyboardSize; //width, height
}


#pragma mark - Class methods

//in case making JTextView in code
- (id)initWithFrame:(CGRect)frame
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    self = [super initWithFrame:frame];
    if (self)
    {
        
    }
    return self;
}



+ (void)initialize
{
    if (self == [JTextView class])
        [self conformsToProtocol:@protocol(UITextInput)];
}



// Called when the UIKeyboardDidShowNotification is sent.
- (void)keyboardDidShow:(NSNotification *)notification
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    //키보드 사이즈 인스턴스 변수에 저장
    NSDictionary *userInfo = [notification userInfo];
    _keyboardSize = [[userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
//    NSLog(@"_keyboardSize: %f, %f", _keyboardSize.width, _keyboardSize.height);
    
//    CGPoint _keyboardOrigin = [[userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].origin;
//    NSLog(@"_keyboardOrigin: %f, %f", _keyboardOrigin.x, _keyboardOrigin.y);
    
//    [self updateNoteTextViewFrame];
    [self updateNoteTextViewInset];
}



// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillHide:(NSNotification*)notification
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
//    [self updateNoteTextViewFrameInCaseDown];
    [self updateNoteTextViewInsetInCaseDown];
}



//텍스트 뷰의 인셋 사이즈 변경
- (void)updateNoteTextViewInset
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    // Step 1: Adjust the bottom content inset of your scroll view by the keyboard height.
    UIEdgeInsets contentInset = self.contentInset;
    contentInset.bottom = _keyboardSize.height;
    self.contentInset = contentInset;
}


- (void)updateNoteTextViewInsetInCaseDown
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    UIEdgeInsets contentInsets = UIEdgeInsetsZero;
    self.contentInset = contentInsets;
    self.scrollIndicatorInsets = contentInsets;
}


//텍스트 뷰의 프레임 사이즈 변경
- (void)updateNoteTextViewFrame
{
    self.frame = CGRectMake(0, kSTATUSBAR_OFFSET, _applicationFrame.size.width, _applicationFrame.size.height - _keyboardSize.height); //kSTATUSBAR_OFFSET: 20
}


- (void)updateNoteTextViewFrameInCaseDown
{
    _keyboardSize = CGSizeMake(0.0, 0.0);
    
    [UIView animateWithDuration:0.3 animations:^{
        [self updateNoteTextViewFrame];
    }];
}


@end




//AppDelegate.h

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@end




//AppDelegate.m

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    return YES;
}


@end





//NoteViewController.h

@interface NoteViewController : UIViewController

@end




//NoteViewController.m

#import "JTextView.h"

@interface NoteViewController () <UITextViewDelegate>

@end


@implementation NoteViewController
{
    JTextView *_textView;
    CGRect _applicationFrame;
}



- (void)loadView
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    _applicationFrame = [[UIScreen mainScreen] applicationFrame]; //Frame: : 0, 20, 320, 548
    
    //텍스트 뷰 생성
    _textView = [[JTextView alloc] initWithFrame:CGRectMake(0.0, kSTATUSBAR_OFFSET, _applicationFrame.size.width, _applicationFrame.size.height)]; //Frame: 0, 20, 320, 548, kSTATUSBAR_OFFSET: 20
//    CGRect textViewFrame = _textView.frame;
//    NSLog (@"textViewFrame: %f, %f, %f, %f", textViewFrame.origin.x, textViewFrame.origin.y, textViewFrame.size.width, textViewFrame.size.height);
    
    //텍스트 뷰 속성
    _textView.font = [UIFont systemFontOfSize:14]; //텍스트 뷰 폰트
    _textView.backgroundColor = [UIColor colorWithRed:0.95 green:0.95 blue:0.93 alpha:1];
    _textView.keyboardDismissMode = UIScrollViewKeyboardDismissModeInteractive;
    
    [_textView setTextContainerInset:UIEdgeInsetsMake(kINSET_TOP, kINSET_LEFT, kINSET_BOTTOM, kINSET_RIGHT)]; //텍스트 뷰 인셋 iOS 7
    
    CALayer *imageLayer = _textView.layer;
    [imageLayer setCornerRadius:10];
    
    _textView.delegate = self;
    
    //컨테이너 뷰 생성
    UIView *containerView = [[UIView alloc] initWithFrame:_applicationFrame];
    [containerView addSubview:_textView];
    
    //뷰 속성
    self.view = containerView;
    self.view.backgroundColor = [UIColor colorWithRed:0.99 green:0.4 blue:0.43 alpha:1];
}



#pragma mark - View Life Cycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    //더미 텍스트 파일 불러오기
    NSError *error;
    NSString* path = [[NSBundle mainBundle] pathForResource:@"dummyText" ofType:@"txt"];
    NSString* content = [NSString stringWithContentsOfFile:path
                                                  encoding:NSUTF8StringEncoding
                                                     error:&error];
    _textView.text = content;

    [self registerForKeyboardNotifications];
}



- (void)viewWillDisappear:(BOOL)animated
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    [super viewWillDisappear:animated];
    
    [[NSNotificationCenter defaultCenter] removeObserver:self]; //키보드 옵저버 해제
}



#pragma mark - Keyboard Notifications

// Call this method somewhere in your view controller setup code.
- (void)registerForKeyboardNotifications
{
    //키보드 팝업 옵저버 (키보드 팝업 시 텍스트 뷰 사이즈 조절)
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:)
                                                 name:UIKeyboardDidShowNotification object:self.view.window];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification object:self.view.window];
    
}


// Called when the UIKeyboardDidShowNotification is sent.
- (void)keyboardDidShow:(NSNotification *)notification
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    [_textView keyboardDidShow:notification];
    [self moveTextToCaretPosition:_textView withAnimation:YES];
}



// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillHide:(NSNotification*)notification
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    [_textView keyboardWillHide:notification];
}



#pragma mark - UITextView delegate method (optional)

- (void)textViewDidBeginEditing:(UITextView *)textView
{
    _textView.backgroundColor = [UIColor colorWithRed:0.68 green:0.85 blue:0.94 alpha:1];
}


- (void)textViewDidEndEditing:(UITextView *)textView
{
    _textView.backgroundColor = [UIColor colorWithRed:0.95 green:0.95 blue:0.93 alpha:1];
}


#pragma mark UITextView change selection, text

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    return YES;
}


- (void)textViewDidChangeSelection:(UITextView *)textView
{
    
}


- (void)textViewDidChange:(UITextView *)textView
{
//    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    [self moveTextToCaretPosition:textView withAnimation:YES];
}



- (void)moveTextToCaretPosition:(UITextView *)textView withAnimation:(BOOL)shouldAnimate
{
    // where the blinky caret is
    CGRect caretRect = [textView caretRectForPosition:textView.selectedTextRange.start];
    CGFloat offscreen = caretRect.origin.y + caretRect.size.height - (textView.contentOffset.y + textView.bounds.size.height - textView.contentInset.bottom - textView.contentInset.top);
    
    CGPoint offsetP = textView.contentOffset;
    offsetP.y += offscreen + 1; // 3 px -- margin puts caret 3 px above bottom
    
    if (offsetP.y >= 0) {
        if (shouldAnimate) {
            [UIView animateWithDuration:0.3 animations:^{
                [textView setContentOffset:offsetP];
            }];
        }
        else {
            [textView setContentOffset:offsetP];
        }
    }
}



#pragma mark - Memory Warning

- (void)didReceiveMemoryWarning
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    [super didReceiveMemoryWarning];
}



@end