cdts/xdts-ios 3/TreeHole/Code/Utility/InputView/FSTextInputView.m

//
//  FSTextInputView.m
//  FashionApp
//
//  Created by 1 on 2018/5/25.
//  Copyright © 2018年 1. All rights reserved.
//

#import "FSTextInputView.h"
#import "NSString+MTLimit.h"

@interface FSTextInputView() <UITextViewDelegate>

@end

@implementation FSTextInputView

- (instancetype)init
{
    if (self = [super init]) {
        [self createInputview];
    }
    return self;
}

- (instancetype)initWithFrame:(CGRect)frame
{
    if(self = [super initWithFrame:frame])
    {
        [self createInputview];
    }
    return self;
}

- (void)layoutSubviews
{
    [super layoutSubviews];
    
    _textview.frame = CGRectMake(self.padding.left, self.padding.top, self.width - self.padding.left - self.padding.right, self.height - self.padding.top - self.padding.bottom);
    
    _placeHolderLabel.frame = _textview.bounds;
    _placeHolderLabel.x = _textview.x + 8;
    _placeHolderLabel.width = _textview.width - _placeHolderLabel.x;
    _placeHolderLabel.height = _textview.height;
    _placeHolderLabel.font = _textview.font;
    _placeHolderLabel.hidden = _textview.text.length > 0;
//    [self.placeHolderLabel sizeToFit];
}

- (void)updateUI
{
    
}

- (void)createInputview
{
    self.padding = UIEdgeInsetsMake(10, 10, 10, 10);
    _textview = [[UITextView alloc] initWithFrame:CGRectZero];
    _textview.showsVerticalScrollIndicator = NO;
    _textview.showsHorizontalScrollIndicator = NO;
    _textview.backgroundColor = [UIColor clearColor];
    _textview.scrollsToTop = NO;
    _textview.textColor = TITLE_COLOR;
    _textview.textContainerInset = UIEdgeInsetsMake(0, 0, 0, 0);
    _textview.layoutManager.allowsNonContiguousLayout = NO;
    _textview.font = MT_FONT_REGULAR_SIZE(15);
    [self addSubview:_textview];
    _textview.delegate = self;
    
    self.maxTextLength = 14000;
    
    // 控制textviw里面属性
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    paragraphStyle.lineSpacing = 5;// 字体的行间距 _textview高度太大，这个值太小会出问题
//    paragraphStyle.firstLineHeadIndent = 0.f;    /**首行缩进宽度*/
//    paragraphStyle.alignment = NSTextAlignmentJustified;
    NSDictionary *attributes = @{
                                 NSParagraphStyleAttributeName:paragraphStyle
                                 };
    _textview.attributedText = [[NSAttributedString alloc] initWithString:_textview.text attributes:attributes];
    
    // _placeHolderLabel
    _placeHolderLabel = [[UILabel alloc] init];
    _placeHolderLabel.font = _textview.font;
    _placeHolderLabel.textColor = COLOR_WITH_RGB(0xC7C7CD);
    _placeHolderLabel.x = 5;
    _placeHolderLabel.numberOfLines = 0;
    [_textview addSubview:_placeHolderLabel];
}

#pragma mark - UITextViewDelegate
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    NSString *temstr = [textView.text stringByReplacingCharactersInRange:range withString:text];
    temstr = temstr ? : @"";

    if (temstr.length == 0) {
        _placeHolderLabel.hidden = NO;
    }else {
        _placeHolderLabel.hidden = YES;
    }
    UITextRange *selectedRange = [textView markedTextRange];
    // 获取高亮部分 中文联想
    UITextPosition *posi = [textView positionFromPosition:selectedRange.start offset:0];
    
    // 如果在变化中是高亮部分在变，就不要计算字符
    if (selectedRange && posi) {
        return YES;
    }
    if (temstr.length > self.maxTextLength) {
        textView.text = [temstr mt_safeSubStringWithStringLength:self.maxTextLength];
        // 移动光标
        textView.selectedRange = NSMakeRange(textView.text.length, 0);
        
        if ([self.delegate respondsToSelector:@selector(didChangeText:)]) {
            [self.delegate didChangeText:self];
        }
        
        return NO;
    } 
    
    return YES;
}

- (void)textViewDidChange:(UITextView *)textView
{
    UITextRange *selectedRange = [textView markedTextRange];
    // 获取高亮部分 中文联想
    UITextPosition *posi = [textView positionFromPosition:selectedRange.start offset:0];
    
    // 如果在变化中是高亮部分在变，就不要计算字符
    if (selectedRange && posi) {
        return;
    }
    if (textView.text.length > self.maxTextLength) {
        textView.text = [textView.text mt_safeSubStringWithStringLength:self.maxTextLength];
        // 移动光标
        textView.selectedRange = NSMakeRange(textView.text.length, 0);
    }
    
    if (self.didChangeText) {
        self.didChangeText(self);
    }
    if ([self.delegate respondsToSelector:@selector(didChangeText:)]) {
        [self.delegate didChangeText:self];
    }
    _placeHolderLabel.hidden = textView.text.length;
}

- (void)clear {
    self.textview.text = nil;
    _placeHolderLabel.hidden = NO;
}

#pragma mark tool--
- (void)resignFirstResp
{
    if([_textview canBecomeFirstResponder])
    {
        [_textview becomeFirstResponder];
    }
}

#pragma mark - Getter

- (NSString *)content
{
    return _textview.text;
}

@end