//1.在.h文件中
#import#define MaxTextViewHeight 80 //限制文字输入的高度
@interface EwenTextView : UIView
//------ 发送文本 -----//
@property (nonatomic,copy) void (^EwenTextViewBlock)(NSString *text);
//------ 设置占位符 ------//
- (void)setPlaceholderText:(NSString *)text;
@end
// 2. 在.m文件中
//需要注意的是，demo依赖于第三方库Masonry
#import "EwenTextView.h"
#import "Masonry.h"
#define kScreenBounds ([[UIScreen mainScreen] bounds])
#define kScreenwidth (kScreenBounds.size.width)
#define kScreenheight (kScreenBounds.size.height)
#define UIColorRGB(x,y,z) [UIColor colorWithRed:x/255.0 green:y/255.0 blue:z/255.0 alpha:1.0]
@interface EwenTextView(){
BOOL statusTextView;//当文字大于限定高度之后的状态
NSString *placeholderText;//设置占位符的文字
}
@property (nonatomic, strong) UIView *backGroundView;
@property (nonatomic, strong) UITextView *textView;
@property (nonatomic, strong) UILabel *placeholderLabel;
@property (nonatomic, strong) UIButton *sendButton;
@end
@implementation EwenTextView
- (instancetype)initWithFrame:(CGRect)frame{
self = [super initWithFrame:frame];
if (self) {
[self createUI];
//增加监听，当键盘出现或改变时收出消息
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:)name:UIKeyboardWillShowNotification object:nil];
//增加监听，当键退出时收出消息
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:)name:UIKeyboardWillHideNotification
object:nil];
}
/**
点击 空白区域取消
*/
UITapGestureRecognizer *centerTap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(centerTapClick)];
[self addGestureRecognizer:centerTap];
return self;
}
- (void)createUI{
[self.textView mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.mas_equalTo(6);
make.left.mas_equalTo(5);
make.bottom.mas_equalTo(-6);
make.width.mas_equalTo(kScreenwidth-65);
}];
[self.placeholderLabel mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.mas_equalTo(5);
make.left.mas_equalTo(10);
make.height.mas_equalTo(39);
}];
[self.sendButton mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.mas_equalTo(8);
make.right.mas_equalTo(-5);
make.width.mas_equalTo(50);
}];
}
//暴露的方法
- (void)setPlaceholderText:(NSString *)text{
placeholderText = text;
self.placeholderLabel.text = placeholderText;
}
//当键盘出现或改变时调用
- (void)keyboardWillShow:(NSNotification *)aNotification
{
self.frame = kScreenBounds;
//获取键盘的高度
NSDictionary *userInfo = [aNotification userInfo];
NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
CGRect keyboardRect = [aValue CGRectValue];
int height = keyboardRect.size.height;
if (self.textView.text.length == 0) {
self.backGroundView.frame = CGRectMake(0, kScreenheight-height-49, kScreenwidth, 49);
}else{
CGRect rect = CGRectMake(0, kScreenheight - self.backGroundView.frame.size.height-height, kScreenwidth, self.backGroundView.frame.size.height);
self.backGroundView.frame = rect;
}
}
//当键退出时调用
- (void)keyboardWillHide:(NSNotification *)aNotification
{
if (self.textView.text.length == 0) {
self.backGroundView.frame = CGRectMake(0, 0, kScreenwidth, 49);
self.frame = CGRectMake(0, kScreenheight-49, kScreenwidth, 49);
}else{
CGRect rect = CGRectMake(0, 0, kScreenwidth, self.backGroundView.frame.size.height);
self.backGroundView.frame = rect;
self.frame = CGRectMake(0, kScreenheight - rect.size.height, kScreenwidth, self.backGroundView.frame.size.height);
}
}
- (void)centerTapClick{
[self.textView resignFirstResponder];
}
#pragma mark --- UITextViewDelegate
- (void)textViewDidChange:(UITextView *)textView{
/**
* 设置占位符
*/
if (textView.text.length == 0) {
self.placeholderLabel.text = placeholderText;
[self.sendButton setBackgroundColor:UIColorRGB(180, 180, 180)];
self.sendButton.userInteractionEnabled = NO;
}else{
self.placeholderLabel.text = @"";
[self.sendButton setBackgroundColor:UIColorRGB(70 , 163, 231)];
self.sendButton.userInteractionEnabled = YES;
}
//---- 计算高度 ---- //
CGSize size = CGSizeMake(kScreenwidth-65, CGFLOAT_MAX);
NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:[UIFont systemFontOfSize:16],NSFontAttributeName, nil];
CGFloat curheight = [textView.text boundingRectWithSize:size
options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
attributes:dic
context:nil].size.height;
CGFloat y = CGRectGetMaxY(self.backGroundView.frame);
if (curheight < 19.094) {
statusTextView = NO;
self.backGroundView.frame = CGRectMake(0, y - 49, kScreenwidth, 49);
}else if(curheight < MaxTextViewHeight){
statusTextView = NO;
self.backGroundView.frame = CGRectMake(0, y - textView.contentSize.height-10, kScreenwidth,textView.contentSize.height+10);
}else{
statusTextView = YES;
return;
}
}
#pragma mark -- 发送事件
- (void)sendClick:(UIButton *)sender{
[self.textView endEditing:YES];
if (self.EwenTextViewBlock) {
self.EwenTextViewBlock(self.textView.text);
}
//---- 发送成功之后清空 ------//
self.textView.text = nil;
self.placeholderLabel.text = placeholderText;
[self.sendButton setBackgroundColor:UIColorRGB(180, 180, 180)];
self.sendButton.userInteractionEnabled = NO;
self.frame = CGRectMake(0, kScreenheight-49, kScreenwidth, 49);
self.backGroundView.frame = CGRectMake(0, 0, kScreenwidth, 49);
}
#pragma mark --- 懒加载控件
- (UIView *)backGroundView{
if (!_backGroundView) {
_backGroundView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, kScreenwidth, 49)];
_backGroundView.backgroundColor = UIColorRGB(230, 230, 230);
[self addSubview:_backGroundView];
}
return _backGroundView;
}
- (UITextView *)textView{
if (!_textView) {
_textView = [[UITextView alloc]init];
_textView.font = [UIFont systemFontOfSize:16];
_textView.delegate = self;
_textView.layer.cornerRadius = 5;
[self.backGroundView addSubview:_textView];
}
return _textView;
}
- (UILabel *)placeholderLabel{
if (!_placeholderLabel) {
_placeholderLabel = [[UILabel alloc]init];
_placeholderLabel.font = [UIFont systemFontOfSize:16];
_placeholderLabel.textColor = [UIColor grayColor];
[self.backGroundView addSubview:_placeholderLabel];
}
return _placeholderLabel;
}
- (UIButton *)sendButton{
if (!_sendButton) {
_sendButton = [[UIButton alloc]init];
[_sendButton setBackgroundColor:UIColorRGB(180, 180, 180)];
[_sendButton setTitle:@"发送" forState:UIControlStateNormal];
[_sendButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[_sendButton addTarget:self action:@selector(sendClick:) forControlEvents:UIControlEventTouchUpInside];
_sendButton.layer.cornerRadius = 5;
_sendButton.userInteractionEnabled = NO;
[self.backGroundView addSubview:_sendButton];
}
return _sendButton;
}
#pragma mark --- UIScrollViewDelegate
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
if (statusTextView == NO) {
scrollView.contentOffset = CGPointMake(0, 0);
}else{
}
}