//
// ZKPlaceholderTextView.m
// WaterProofer
//
// Created by HELLO WORLD on 2019/9/18.
// Copyright © 2019年 WaterProofer. All rights reserved.
//
#import "ZKPlaceholderTextView.h"
#define kTopY 7.0
#define kLeftX 5.0
@interface ZKPlaceholderTextView()<UITextViewDelegate>
@property(strong,nonatomic) UIColor *placeholder_color;
@property(strong,nonatomic) UIFont * placeholder_font;
/**
* 显示 Placeholder
*/
@property(strong,nonatomic,readonly) UILabel *PlaceholderLabel;
@property(assign,nonatomic) float placeholdeWidth;
@property(copy,nonatomic) id eventBlock;
@property(copy,nonatomic) id BeginBlock;
@property(copy,nonatomic) id EndBlock;
@end
@implementation ZKPlaceholderTextView
#pragma mark - life cycle
- (id) initWithFrame:(CGRect)frame {
if ((self = [super initWithFrame:frame])) {
[self awakeFromNib];
}
return self;
}
- (void)awakeFromNib {
[super awakeFromNib];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(DidChange:) name:UITextViewTextDidChangeNotification object:self];
//UITextViewTextDidBeginEditingNotification
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textViewBeginNoti:) name:UITextViewTextDidBeginEditingNotification object:self];
//UITextViewTextDidEndEditingNotification
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textViewEndNoti:) name:UITextViewTextDidEndEditingNotification object:self];
float left=kLeftX,top=kTopY,hegiht=30;
self.placeholdeWidth=CGRectGetWidth(self.frame)-2*left;
_PlaceholderLabel=[[UILabel alloc] initWithFrame:CGRectMake(left, top
, _placeholdeWidth, hegiht)];
_PlaceholderLabel.numberOfLines=0;
_PlaceholderLabel.lineBreakMode=NSLineBreakByCharWrapping|NSLineBreakByWordWrapping;
[self addSubview:_PlaceholderLabel];
[self defaultConfig];
}
-(void)layoutSubviews
{
float left=kLeftX,top=kTopY,hegiht=self.bounds.size.height;
self.placeholdeWidth=CGRectGetWidth(self.frame)-2*left;
CGRect frame=_PlaceholderLabel.frame;
frame.origin.x=left;
frame.origin.y=top;
frame.size.height=hegiht;
frame.size.width=self.placeholdeWidth;
_PlaceholderLabel.frame=frame;
[_PlaceholderLabel sizeToFit];
}
-(void)dealloc{
[_PlaceholderLabel removeFromSuperview];
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
#pragma mark - System Delegate
#pragma mark - custom Delegate
#pragma mark - Event response
-(void)defaultConfig
{
self.placeholder_color = [UIColor lightGrayColor];
self.placeholder_font = [UIFont systemFontOfSize:14];
self.maxTextLength=1000;
self.layoutManager.allowsNonContiguousLayout=NO;
}
-(void)addMaxTextLengthWithMaxLength:(NSInteger)maxLength andEvent:(void (^)(ZKPlaceholderTextView *text))limit
{
if (maxLength>0) {
_maxTextLength=maxLength;
}
if (limit) {
_eventBlock=limit;
}
}
-(void)addTextViewBeginEvent:(void (^)(ZKPlaceholderTextView *))begin{
_BeginBlock=begin;
}
-(void)addTextViewEndEvent:(void (^)(ZKPlaceholderTextView *))End{
_EndBlock=End;
}
-(void)setUpdateHeight:(float)updateHeight{
CGRect frame=self.frame;
frame.size.height=updateHeight;
self.frame=frame;
_updateHeight=updateHeight;
}
//供外部使用的 api
-(void)setPlaceholderFont:(UIFont *)font
{
self.placeholder_font=font;
}
-(void)setPlaceholderColor:(UIColor *)color
{
self.placeholder_color=color;
}
-(void)setPlaceholderOpacity:(float)opacity
{
if (opacity<0) {
opacity=1;
}
self.PlaceholderLabel.layer.opacity=opacity;
}
#pragma mark - Noti Event
-(void)textViewBeginNoti:(NSNotification*)noti{
if (_BeginBlock) {
void(^begin)(ZKPlaceholderTextView*text)=_BeginBlock;
begin(self);
}
}
-(void)textViewEndNoti:(NSNotification*)noti{
if (_EndBlock) {
void(^end)(ZKPlaceholderTextView*text)=_EndBlock;
end(self);
}
}
-(void)DidChange:(NSNotification*)noti{
if (self.placeholder.length == 0 || [self.placeholder isEqualToString:@""]) {
_PlaceholderLabel.hidden=YES;
}
if (self.text.length > 0) {
_PlaceholderLabel.hidden=YES;
}
else{
_PlaceholderLabel.hidden=NO;
}
NSString *lang = [[self.nextResponder textInputMode] primaryLanguage]; // 键盘输入模式
if ([lang isEqualToString:@"zh-Hans"]) { // 简体中文输入，包括简体拼音，健体五笔，简体手写
UITextRange *selectedRange = [self markedTextRange];
//获取高亮部分
UITextPosition *position = [self positionFromPosition:selectedRange.start offset:0];
// 没有高亮选择的字，则对已输入的文字进行字数统计和限制
if (!position) {
if (self.text.length > self.maxTextLength) {
self.text = [self.text substringToIndex:self.maxTextLength];
}
}
// 有高亮选择的字符串，则暂不对文字进行统计和限制
else{
}
}
// 中文输入法以外的直接对其统计限制即可，不考虑其他语种情况
else{
if (self.text.length > self.maxTextLength) {
self.text = [ self.text substringToIndex:self.maxTextLength];
}
}
if (_eventBlock && self.text.length > self.maxTextLength) {
void (^limint)(ZKPlaceholderTextView*text) =_eventBlock;
limint(self);
}
}
#pragma mark - private method
+(float)boundingRectWithSize:(CGSize)size withLabel:(NSString *)label withFont:(UIFont *)font{
NSDictionary *attribute = @{NSFontAttributeName:font};
// CGSize retSize;
CGSize retSize = [label boundingRectWithSize:size
options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading
attributes:attribute
context:nil].size;
return retSize.height;
}
#pragma mark - getters and Setters
-(void)setText:(NSString *)tex{
if (tex.length>0) {
_PlaceholderLabel.hidden=YES;
}
[super setText:tex];
}
-(void)setPlaceholder:(NSString *)placeholder{
if (placeholder.length == 0 || [placeholder isEqualToString:@""]) {
_PlaceholderLabel.hidden=YES;
}
else
{
_PlaceholderLabel.text=placeholder;
_placeholder=placeholder;
// float height= [ZKPlaceholderTextView boundingRectWithSize:CGSizeMake(_placeholdeWidth, MAXFLOAT) withLabel:_placeholder withFont:_PlaceholderLabel.font];
// if (height>CGRectGetHeight(_PlaceholderLabel.frame) && height< CGRectGetHeight(self.frame)) {
//
// CGRect frame=_PlaceholderLabel.frame;
// frame.size.height=height;
// _PlaceholderLabel.frame=frame;
//
// }
}
}
-(void)setPlaceholder_font:(UIFont *)placeholder_font
{
_placeholder_font=placeholder_font;
_PlaceholderLabel.font=placeholder_font;
}
-(void)setPlaceholder_color:(UIColor *)placeholder_color
{
_placeholder_color=placeholder_color;
_PlaceholderLabel.textColor=placeholder_color;
}
@end
