iOS 实现一个最简单的文本聊天框（自动根据内容改变高度）
2018-01-30 本文已影响148人
JohnayXiao
IMG_4719.PNG
IMG_4720.PNG
.h文件
#import <UIKit/UIKit.h>
@protocol XJAutoHeightInputTextViewDelegate <NSObject>
@optional
- (void)postBtnClick:(UITextView *)textView complection:(void(^)(BOOL isDone))complectionBlock;
@end
@interface XJAutoHeightInputTextView : UIView
@property (nonatomic,strong)id <XJAutoHeightInputTextViewDelegate> delegate;
-(instancetype)initWithDelegate:(id)delegate;
@end
.m文件
#import "XJAutoHeightInputTextView.h"
//所有的宏在这里，自行删除
#define XJ_ScreenWidth [UIScreen mainScreen].bounds.size.width
#define XJ_ScreenHeight [UIScreen mainScreen].bounds.size.height
// iPhone X
#define XJ_iPhoneX (XJ_ScreenWidth == 375.f && XJ_ScreenHeight == 812.f ? YES : NO)
#define XJ_StatusBarHeight (XJ_iPhoneX ? 44.f : 20.f)
#define XJ_NavigationBarHeight (XJ_iPhoneX ? 88.f : 64.f)
#define XJ_TabbarHeight (XJ_iPhoneX ? (49.f+34.f) : 49.f)
#define XJ_safeBottomMargin (XJ_iPhoneX ? 34.f : 0.f)
@interface XJAutoHeightInputTextView()<UITextViewDelegate>
@property (nonatomic,weak)UITextView * textView;
/**总共字数*/
@property (nonatomic,weak)UILabel * numberLable;
/**默认提示语*/
@property (nonatomic,weak)UILabel * apleLable;
@property (nonatomic,strong)UILabel *sendLable;
@property (nonatomic, assign) CGRect keyBordFrame;
@end
@implementation XJAutoHeightInputTextView
-(instancetype)initWithDelegate:(id)delegate
{
if (self = [super init])
{
self.delegate = delegate;
self.frame = CGRectMake(0, XJ_ScreenHeight - XJ_TabbarHeight, XJ_ScreenWidth, 49);
self.backgroundColor = [UIColor whiteColor];
UITextView * textView = [[UITextView alloc] initWithFrame:CGRectMake(15, 4.5, self.bounds.size.width/1.3, 40)];
self.textView = textView;
//颜色自行设置啊。。。
// textView.backgroundColor = grayBgColor();
textView.layer.cornerRadius = textView.frame.size.height / 2.0;
textView.layer.masksToBounds = YES;
textView.delegate = self;
textView.scrollEnabled= NO;
textView.keyboardType = UIKeyboardTypeDefault;
textView.returnKeyType = UIReturnKeySend;
textView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
textView.font=[UIFont fontWithName:@"Arial" size:18.0];
textView.textAlignment = NSTextAlignmentLeft;
// textView.textColor = [UIColor colorWithHexString:@"5d6573"];
textView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;;
[self addSubview:textView];
UILabel * apleLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, textView.frame.origin.y-2, textView.bounds.size.width-30, textView.bounds.size.height)];
apleLabel.text = @" 请输入评论";
apleLabel.textAlignment = NSTextAlignmentLeft;
apleLabel.textColor = [UIColor colorWithRed:170/255.0 green:170/255.0 blue:170/255.0 alpha:0.8];
apleLabel.font = [UIFont fontWithName:@"Arial" size:17.0];
self.apleLable = apleLabel;
[self addSubview:apleLabel];
UILabel * sendLable = [[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMaxX(textView.frame) , 4.5, 60, 40)];
sendLable.textAlignment = NSTextAlignmentCenter;
sendLable.text = @"发送";
// sendLable.textColor = grayDarkTextColor();
sendLable.font = [UIFont fontWithName:@"Arial" size:16.0];
sendLable.userInteractionEnabled = YES;
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(done)];
[sendLable addGestureRecognizer:tap];
self.sendLable = sendLable;
[self addSubview:sendLable];
UILabel * numberLable = [[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMaxX(textView.frame), (self.bounds.size.height - 40), 60, 20)];
numberLable.textAlignment = NSTextAlignmentCenter;
numberLable.textColor = [UIColor colorWithRed:170/255.0 green:170/255.0 blue:170/255.0 alpha:1];
numberLable.text = @"140/140";
numberLable.font = [UIFont fontWithName:@"Arial" size:12.0];
self.numberLable = numberLable;
[self addSubview:numberLable];
numberLable.hidden = YES;
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textDidChanged:) name:UITextViewTextDidChangeNotification object:nil];
}
return self;
}
/**键盘出现*/
- (void)keyboardWillShow:(NSNotification*)notification
{
CGRect keyboardRect = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
self.keyBordFrame = keyboardRect;
[UIView animateWithDuration:0.3 animations:^{
self.frame = CGRectMake(0, XJ_ScreenHeight - keyboardRect.size.height - self.bounds.size.height, XJ_ScreenWidth, self.bounds.size.height);
}];
}
/**键盘下落*/
- (void)keyboardWillHide:(NSNotification*)notification
{
[UIView animateWithDuration:0.38 animations:^{
self.frame = CGRectMake(0, XJ_ScreenHeight - self.bounds.size.height - XJ_safeBottomMargin, XJ_ScreenWidth, self.bounds.size.height);
}completion:^(BOOL finished) {
}];
}
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
if ([text isEqualToString:@"\n"]) {
[self done];
return YES;
} else{
NSString *new = [textView.text stringByReplacingCharactersInRange:range withString:text];
if (new.length) {
self.apleLable.hidden = YES;
}else{
self.apleLable.hidden = NO;
}
NSInteger lenth= [new length];
if (lenth >140)
{
return NO;
}else{
NSInteger numb = 140 - lenth;
self.numberLable.text = [NSString stringWithFormat:@"%ld/140",numb];
}
NSInteger res = 140-[new length];
if(res >= 0)
{
return YES;
}else{
NSRange rg = {0,[text length]+res};
if (rg.length>0) {
NSString *s = [text substringWithRange:rg];
[textView setText:[textView.text stringByReplacingCharactersInRange:range withString:s]];
}
return NO;
}
}
}
/**监听文字改变 换行时要更改输入框的位置*/
- (void)textDidChanged:(NSNotification *)notif
{
static CGFloat maxHeight = 40.0f;
CGRect frame = self.textView.frame;
CGSize constraintSize = CGSizeMake(frame.size.width, MAXFLOAT);
CGSize size = [self.textView sizeThatFits:constraintSize];
maxHeight = size.height <= 40 ? 40 : size.height;
CGFloat heightSelf = maxHeight + 9;
[UIView animateWithDuration:0.38 animations:^{
self.frame = CGRectMake(0, XJ_ScreenHeight - self.keyBordFrame.size.height - heightSelf, XJ_ScreenWidth, heightSelf);
self.textView.frame = CGRectMake(15, 4.5, frame.size.width, maxHeight);
self.sendLable.frame = CGRectMake(CGRectGetMaxX(self.textView.frame), (self.bounds.size.height - 44.5), 60, 40);
if (maxHeight <= 40) {
self.numberLable.hidden = YES;
} else self.numberLable.hidden = NO;
}];
}
//发送
- (void)done
{
[self.textView resignFirstResponder];
if ([self.delegate respondsToSelector:@selector(postBtnClick:complection:)]) {
[self.delegate postBtnClick:self.textView complection:^(BOOL isDone) {
[self.textView resignFirstResponder];
self.frame = CGRectMake(0, XJ_ScreenHeight - XJ_TabbarHeight, XJ_ScreenWidth, 49);
self.textView.frame = CGRectMake(15, 4.5, self.bounds.size.width/1.3, 40);
self.sendLable.frame = CGRectMake(CGRectGetMaxX(self.textView.frame), 4.5, 60, 40);
self.textView.text = @" ";
self.apleLable.hidden = NO;
self.numberLable.text = @"140";
self.numberLable.hidden = YES;
}];
}
}
#pragma mark - setter
-(void)dealloc //移除通知
{
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UITextViewTextDidChangeNotification object:nil];
}
@end
