ComposeCommentView.m

//
//  ComposeCommentView.m
//  Blocstagram_V3
//
//  Created by Diego Aguirre on 6/10/15.
//  Copyright (c) 2015 Diego Aguirre. All rights reserved.
//

#import "ComposeCommentView.h"

@interface ComposeCommentView () <UITextViewDelegate>

@property (nonatomic, strong) UITextView *textView;
@property (nonatomic, strong) UIButton *button;
@property (nonatomic, strong) UIDynamicAnimator *dynamicBounce;

@end

@implementation ComposeCommentView

- (id) initWithFrame:(CGRect)frame{

    self = [super initWithFrame:frame];
    
    if (self) {
        // Initialization code
        self.textView = [UITextView new];
        self.textView.delegate = self;
        
        self.button = [UIButton buttonWithType:UIButtonTypeCustom];
        [self.button setAttributedTitle:[self commentAttributedString] forState:UIControlStateNormal];
        [self.button addTarget:self action:@selector(commentButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
        
        [self addSubview:self.textView];
        [self.textView addSubview:self.button];
    }
    
    return self;
}

- (NSAttributedString *) commentAttributedString{

    NSString *baseString = NSLocalizedString(@"COMMENT", @"comment button text");
    NSRange range = [baseString rangeOfString:baseString];
    
    NSMutableAttributedString *commentString = [[NSMutableAttributedString alloc]initWithString:baseString];
    
    [commentString addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"HelveticaNeue-Bold" size:10] range:range];
    [commentString addAttribute:NSKernAttributeName value:@1.3 range:range];
    [commentString addAttribute:NSForegroundColorAttributeName value:[UIColor colorWithRed:0.933 green:0.933 blue:0.933 alpha:1] range:range];
    
    return commentString;
}

- (void) layoutSubviews {

    [super layoutSubviews];
    
    self.textView.frame = self.bounds;
    
    if (self.isWritingComment) {
        self.textView.backgroundColor = [UIColor colorWithRed:0.933 green:0.933 blue:0.933 alpha:1];/*#eeeeee*/
        self.button.backgroundColor = [UIColor colorWithRed:0.345 green:0.318 blue:0.424 alpha:1]; /*#58516c*/
        
        
        [UIView animateWithDuration:1.0 delay:0.0 usingSpringWithDamping:0.0 initialSpringVelocity:0.008 options:UIViewAnimationOptionCurveLinear animations:^{
            //your animations go here
            
            CGFloat buttonX = CGRectGetWidth(self.bounds) - CGRectGetWidth(self.button.frame) - 20;
            self.button.frame = CGRectMake(buttonX, 10, 80, 20);
            
            UIDynamicItemBehavior *elasticityBehavior = [[UIDynamicItemBehavior alloc] initWithItems:@[self.button]];
            elasticityBehavior.elasticity = 1.05f;
            [self.dynamicBounce addBehavior:elasticityBehavior];
        }
                         completion:nil];
        
       
    } else {
    
        self.textView.backgroundColor = [UIColor colorWithRed:0.898 green:0.898 blue:0.898 alpha:1];
        self.button.backgroundColor = [UIColor colorWithRed:0.6 green:0.6 blue:0.6 alpha:1];
        
        self.button.frame = CGRectMake(10, 10, 80, 20);
        
        
    }
    
    CGSize buttonSize = self.button.frame.size;
    buttonSize.height += 20;
    buttonSize.width += 20;
    CGFloat blockX = CGRectGetWidth(self.textView.bounds) - buttonSize.width;
    CGRect areaToBlockText = CGRectMake(blockX, 0, buttonSize.width, buttonSize.height);
    UIBezierPath *buttonPath = [UIBezierPath bezierPathWithRect:areaToBlockText];
    
    self.textView.textContainer.exclusionPaths = @[buttonPath];
    
    

}

- (void)stopComposingComment{

    [self.textView resignFirstResponder];
}

#pragma mark - Setters & getters

- (void) setIsWritingComment:(BOOL)isWritingComment{

    [self setIsWritingComment:isWritingComment animated:NO];
}


- (void) setIsWritingComment:(BOOL)isWritingComment animated:(BOOL) animated{

    _isWritingComment = isWritingComment;
    
    if (animated) {
        [UIView animateWithDuration:0.2 animations:^{
            [self layoutSubviews];
        }];
    }else {
    
        [self layoutSubviews];
    }
}

- (void) setText:(NSString *)text{

    _text = text;
    self.textView.text = text;
    self.textView.userInteractionEnabled = YES;
    self.isWritingComment = text.length > 0;
}

#pragma mark - Button Target

- (void)commentButtonPressed:(UIButton *)sender {

    if (self.isWritingComment) {
        [self.textView resignFirstResponder];
        self.textView.userInteractionEnabled = NO;
        [self.delegate commentViewDidPressCommentButton:self];
        
    
    }else {
    
        [self setIsWritingComment:YES animated:YES];
        [self.textView becomeFirstResponder];
    }
}



#pragma mark - UITextViewDelegate

-(BOOL)textViewShouldBeginEditing:(UITextView *)textView{

    [self setIsWritingComment:YES animated:YES];
    [self.delegate commentViewWillStartEditing:self];
    
    return YES;
}

-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{

    NSString *newText = [textView.text stringByReplacingCharactersInRange:range withString:text];
    [self.delegate commentView:self textDidChange:newText];
    
    return YES;
}

-(BOOL)textViewShouldEndEditing:(UITextView *)textView{

    BOOL hasComment = (textView.text.length > 0);
    [self setIsWritingComment:hasComment animated:YES];
    
    return YES;
}


































@end