1v1_7/MSYOUPAI/3rd/View/ZCLiveTextView.m

//
//  TLSLiveTextView.m
//  tls
//
//  Created by 张灿 on 2017/4/24.
//  Copyright © 2017年 tianlishe. All rights reserved.
//

#import "ZCLiveTextView.h"
@interface ZCLiveTextView()<UITextViewDelegate>
@property (nonatomic, weak) UILabel *placeholderLabel;
@property(nonatomic,assign) CGFloat topMargin;
@property(nonatomic,assign) CGFloat leftMargin;
@property (nonatomic, weak) UILabel *alertLabel;
@end
@implementation ZCLiveTextView

- (instancetype)initWithFrame:(CGRect)frame TopMargin:(CGFloat)topMargin LeftMargin:(CGFloat)leftMargin
{
    self = [super initWithFrame:frame];
    if (self) {
        // 1.添加提示文字
        _topMargin = topMargin;
        _leftMargin = leftMargin;
        _timeoutAlertColor = [UIColor redColor];
        
        self.backgroundColor = [UIColor whiteColor];
        UITextView* textview = [[UITextView alloc]init];
        textview.tintColor = ZYPinkColor;
        textview.backgroundColor = [UIColor clearColor];
        textview.font = [UIFont systemFontOfSize:15];
        textview.textColor = HexColorFromRGB(0x333333);
        textview.delegate = self;
        [self addSubview:textview];
        self.textView = textview;
        textview.frame = CGRectMake(leftMargin-3,3,self.frame.size.width-2*leftMargin+6, self.frame.size.height-20);
        //placeHolder
        UILabel *placeholderLabel = [[UILabel alloc] init];
        placeholderLabel.numberOfLines = 0;
        placeholderLabel.textColor = HexColorFromRGB(0xb5b5b5);
        placeholderLabel.hidden = YES;
        placeholderLabel.numberOfLines = 0;
        placeholderLabel.backgroundColor = [UIColor clearColor];
        placeholderLabel.font = LCFont14;
    
        self.placeholderLabel = placeholderLabel;
        [self addSubview:placeholderLabel];
        //alertLabel
        UILabel *alertLabel = [[UILabel alloc] initWithFrame:CGRectMake(self.frame.size.width-leftMargin-200, self.frame.size.height-leftMargin-15, 200, 15)];
        alertLabel.textColor = HexColorFromRGB(0x6C6B70);
        alertLabel.textAlignment = NSTextAlignmentRight;
        alertLabel.numberOfLines = 1;
        alertLabel.backgroundColor = [UIColor clearColor];
        alertLabel.font = LCFont14;
        self.alertLabel = alertLabel;
        [self addSubview:alertLabel];
        // 2.监听textView文字改变的通知
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textDidChange) name:UITextViewTextDidChangeNotification object:self.textView];
        
        [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(textDidChange) name:UITextViewTextDidBeginEditingNotification object:self.textView];
    }
    return self;
}

- (void)setPlaceholder:(NSString *)placeholder
{
    _placeholder = [placeholder copy];
    
    self.placeholderLabel.text = placeholder;
    if (placeholder.length) { // 需要显示
        self.placeholderLabel.hidden = NO;
        
        // 计算frame
        CGFloat placeholderX = _leftMargin;
        CGFloat placeholderY = _topMargin;
        CGFloat maxW = self.frame.size.width - 2 * placeholderX;
        CGFloat maxH = self.frame.size.height - 2 * placeholderY;
        CGSize placeholderSize= [placeholder boundingRectWithSize:CGSizeMake(maxW, maxH) options:NSStringDrawingUsesFontLeading|NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:self.placeholderLabel.font } context:nil].size;
        self.placeholderLabel.frame = CGRectMake(placeholderX, placeholderY, placeholderSize.width+5, placeholderSize.height+5);

    } else {
        self.placeholderLabel.hidden = YES;
    }
}
- (void)setTopMargin:(CGFloat)topMargin{
    _topMargin = topMargin;
}
- (void)setLeftMargin:(CGFloat)leftMargin{
    _leftMargin = leftMargin;
}
- (void)setTimeoutAlertColor:(UIColor *)timeoutAlertColor{
    _timeoutAlertColor = timeoutAlertColor;
}
- (void)setTextLength:(NSInteger)textLength{
    _textLength = textLength;
    self.alertLabel.text = [NSString stringWithFormat:@"%ld/%zd",self.textView.text.length,_textLength];
}
- (void)setPlaceholderColor:(UIColor *)placeholderColor
{
    _placeholderColor = placeholderColor;
    
    self.placeholderLabel.textColor = placeholderColor;
}
- (void)textDidChange
{
    
    self.placeholderLabel.hidden = (self.textView.text.length != 0);
    if (self.textView.text.length<_textLength) {
        self.alertLabel.textColor = HexColorFromRGB(0x6C6B70);
    }else if(self.textView.text.length<=_textLength){
        
        self.alertLabel.textColor = _timeoutAlertColor;
    }else{
        
        self.textView.text = [self.textView.text substringToIndex:_textLength];
    }
    //    self.textView.text = [self.textView.text stringByReplacingOccurrencesOfString:@"\n" withString:@""];
    self.alertLabel.text = [NSString stringWithFormat:@"%ld/%zd",self.textView.text.length,_textLength];
    
}
- (void)textViewDidChangeSelection:(UITextView *)textView{
    [self textDidChange];
}
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{
//    if ([text isEqualToString:@"\n"]) {
//        return NO;
//    }
    return YES;
}
- (void)dealloc
{
    [[NSNotificationCenter defaultCenter]removeObserver:self name:UIKeyboardWillShowNotification object:self];
    [[NSNotificationCenter defaultCenter]removeObserver:self name:UITextViewTextDidChangeNotification object:self.textView];
    [[NSNotificationCenter defaultCenter]removeObserver:self name:UITextViewTextDidBeginEditingNotification object:self.textView];
}

@end