iOS - 計算UITextView 高度 UIScrollView滾動到具體位置

weixin_34393428發表於2017-08-31

螢幕快照 2017-08-31 下午5.14.12.png

螢幕快照 2017-08-31 下午5.14.25.png

//
//  TextVDealVC.m
//  WeiMiQuan
//
//  Created by baiwei on 2017/8/31.
//  Copyright © 2017年 佰微. All rights reserved.
//

#import "TextVDealVC.h"
#import "IQKeyboardManager.h"

#define inputViewH (HeightScreen(49, six))// 輸入框高
#define inputVY  (kScreenHeight - 64 - inputViewH)// 輸入框在最底部時的Y
#define scrollVH (kScreenHeight - 64  - inputViewH)// 最大的scrollV的高
#define litleMargin  HeightMacroScreen(15)//  間距
#define imageBtnWH   WidMacroScreen(200)// 加好按鈕的高寬
#define fileBtnH     WidMacroScreen(150)// 檔案按鈕的高
#define TextVY  (Px30Distance) // textV的Y
#define TextVMaxH  (scrollVH - litleMargin * 2 - imageBtnWH - TextVY)// 最大的textv的高


@interface TextVDealVC ()
<
UITextViewDelegate
>
{
    CGFloat currentScroolH ;
    CGFloat currentInputVY;
    CGFloat currentTextVH;
    CGFloat minTextVH;
}
/** 整個背景scrollV*/
@property (nonatomic,strong) UIScrollView *scroolV;
/** 輸入textv*/
@property (nonatomic,strong) UITextView *textV;
/** 新增圖片按鈕*/
@property (nonatomic,strong) UIButton *imageBtn;
/** 輸入框背景view*/
@property (nonatomic,strong) UIView *inputView;
/** 檔案按鈕*/
@property (nonatomic,strong) UIButton *fileBtn;

@end

@implementation TextVDealVC

-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    // 鍵盤處理
    [IQKeyboardManager sharedManager].enableAutoToolbar = NO;
    [IQKeyboardManager sharedManager].enable = NO;
    [self.textV becomeFirstResponder];
}
- (void)viewDidLoad {
    [super viewDidLoad];
    self.automaticallyAdjustsScrollViewInsets = NO;
    //增加監聽，當鍵盤出現或改變時收出訊息
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShow:)
                                                 name:UIKeyboardWillShowNotification
                                               object:nil];
    //增加監聽，當鍵退出時收出訊息
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:nil];
    // 初始化值
    currentScroolH = scrollVH;
    currentInputVY = inputVY;
    currentTextVH = HeightMacroScreen(300);
    minTextVH = HeightMacroScreen(300);
    // 介面
    [self initUserInterface];
    // 資料
    [self initData];

}

#pragma mark -- Action
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    [super touchesBegan:touches withEvent:event];
    [self.textV resignFirstResponder];
}
// 圖片按鈕點選事件
-(void)imageBtnClick{


}
//計算評論框文字的高度
- (float) heightForTextView: (UITextView *)textView WithText: (NSString *) strText{
    CGSize constraint = CGSizeMake(textView.contentSize.width, CGFLOAT_MAX);
    CGRect size = [strText boundingRectWithSize:constraint
                                        options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading)
                                     attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:Px28FontSize]}
                                        context:nil];
    return size.size.height + HeightMacroScreen(25);
}
// 根據內容長度 實時改變textV的高度
-(void)changeTextVheight:(UITextView *)textView heightT:(CGFloat) heightT{
    CGRect frame = textView.frame;
    float height;
    if ([textView.text isEqual:@""]) {
        if (![textView.text isEqualToString:@""]) {
            height = [ self heightForTextView:textView WithText:[textView.text substringToIndex:[textView.text length] - 1]];
        }else{
            height = [ self heightForTextView:textView WithText:textView.text];
        }
    }else{
        height = heightT;
    }
    if (height > currentTextVH) {
        frame.size.height = height;
        [UIView animateWithDuration:0.5 animations:^{
            textView.frame = frame;
        } completion:nil];
        currentTextVH = height;
        [self layout];
    }else if (height < minTextVH && frame.size.height > minTextVH){
        height = minTextVH;
        frame.size.height = height;
        [UIView animateWithDuration:0.5 animations:^{
            textView.frame = frame;
        } completion:nil];
        currentTextVH = height;
        [self layout];
    }else if(height < minTextVH){
        currentTextVH = minTextVH;
        [self layout];
    }else if (height < currentTextVH && height > minTextVH){
        currentTextVH = height;
        [self layout];
    }
}
#pragma mark -- NSNotificationCenter Action
//當鍵盤出現或改變時呼叫
- (void)keyboardWillShow:(NSNotification *)aNotification
{
    [self changgeYOrH:aNotification keyBoardShow:YES];
}
//當鍵盤隱藏或改變時呼叫
-(void)keyboardWillHide:(NSNotification *)aNotification
{
    [self changgeYOrH:aNotification keyBoardShow:NO];
}
// 根據鍵盤的顯示情況 改變檢視的 y h
-(void)changgeYOrH:(NSNotification *)aNotification keyBoardShow:(BOOL)keyBoardShow{
    //獲取鍵盤的高度
    NSDictionary *userInfo = [aNotification userInfo];
    NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGRect keyboardRect = [aValue CGRectValue];
    CGFloat y = keyboardRect.origin.y;
    int height = keyboardRect.size.height;
    if (keyBoardShow == NO) {
        if (y > inputVY) {
            y = inputVY;
        }
        self.inputView.frame = CGRM(0, inputVY, kScreenWidth, inputViewH);
        self.scroolV.frame = CGRM(0,0, kScreenWidth,scrollVH);
        currentScroolH = scrollVH;
        currentInputVY = inputVY;
        if (self.fileBtn.hidden == YES) {
            if (currentTextVH < TextVMaxH) {
                currentTextVH = TextVMaxH;
            }
        }else{
            if (currentTextVH < (TextVMaxH - litleMargin - fileBtnH)) {
                currentTextVH = (TextVMaxH - litleMargin - fileBtnH);
            }
        }
    }else{
        CGFloat inputViewY = ((inputVY - height));
        [UIView animateWithDuration:0.2 animations:^{
            self.inputView.frame  = CGRM(0,inputViewY , kScreenWidth, inputViewH);
            CGFloat scrollVHH = (scrollVH - height);
            if (self.fileBtn.hidden != YES) {
                scrollVHH += (litleMargin + fileBtnH);
            }
            self.scroolV.frame = CGRM(0,0, kScreenWidth,scrollVHH);
            minTextVH = (scrollVH - height - litleMargin * 2 - imageBtnWH - TextVY);
            CGFloat height = [self heightForTextView:self.textV WithText:self.textV.text];
            [self changeTextVheight:self.textV heightT:height];
            currentScroolH = scrollVHH;
            currentInputVY = inputViewY;
        }];
    }
    [self layout];
}
#pragma mark -- UITextViewDelegate
- (void)textViewDidChange:(UITextView *)textView{
    if (textView.markedTextRange != nil) {
        return;
    }
    NSRange range = [textView selectedRange];
    if (textView == self.textV) {
        if (textView.text.length > 10000) {
            textView.text = [textView.text substringToIndex:10000];
        }
    }
    CGFloat height = [self heightForTextView:textView WithText:[NSString stringWithFormat:@"%@",textView.text]];
    [self changeTextVheight:textView heightT:height];
    textView.selectedRange = range;
}
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    if (textView.markedTextRange != nil) {
        CGFloat height = [self heightForTextView:textView WithText:[NSString stringWithFormat:@"%@%@",textView.text,text]];
        [self changeTextVheight:textView heightT:height];
        return YES;
    }
    if (textView == self.textV) {
        if (textView.text.length >= 10000) {
            if (text.length > 0) {
                [MBProgressHUD showMoreLine:@"字數超過10000字" view:nil];
                return NO;
            }
        }
    }
    CGFloat height = [self heightForTextView:textView WithText:[NSString stringWithFormat:@"%@%@",textView.text,text]];
    [self changeTextVheight:textView heightT:height];
    return YES;
}
#pragma mark -- 資料
-(void)initData{
    
    
}

#pragma mark -- 介面
-(void)initUserInterface{
    self.navigationItem.title = @"傳送至";
    
    // 整個背景scrollV
    UIScrollView *scroolV = [[UIScrollView alloc]init];
    [self.view addSubview:scroolV];
    self.scroolV = scroolV;
    
    // 輸入textv
    UITextView *textV = MakeTextView(Px28FontSize, BlackColor);
    textV.scrollEnabled = NO;
    textV.backgroundColor = kTenFontColor;
    textV.delegate = self;
    [scroolV addSubview:textV];
    self.textV = textV;
    
    // 新增圖片按鈕
    UIButton *imageBtn = MakeImageButtonWith(@"home_add_circle");
    [imageBtn addTarget:self action:@selector(imageBtnClick) forControlEvents:UIControlEventTouchUpInside];
    MakeLineWithId(imageBtn, LitleLineH, kTenFontColor);
    [scroolV addSubview:imageBtn];
    self.imageBtn = imageBtn;
    

    // 檔案按鈕
    UIButton *fileBtn = MakeButton(ThemeColor);
    [scroolV addSubview:fileBtn];
    self.fileBtn = fileBtn;
//    self.fileBtn.hidden = YES;
    
    // 輸入框背景view
    self.inputView  = [[UIView alloc]initWithFrame:CGRM(0,inputVY , kScreenWidth, inputViewH)];
    MakeLineWithId(self.inputView, LitleLineH, kNineFontColor);
    self.inputView.backgroundColor = [UIColor whiteColor];
    // 設定陰影
    self.inputView .layer.shadowColor = [UIColor grayColor].CGColor;
    self.inputView .layer.shadowOffset = CGSizeMake(0, -3);
    self.inputView .layer.shadowOpacity = 0.1;
    [self.view addSubview:self.inputView];
    
    // 佈局
    [self layout];
}

#pragma mark -- 佈局
-(void)layout{

    // 整個背景scrollV
    self.scroolV.frame = CGRM(0, 0, kScreenWidth, currentScroolH);
    // 輸入textv
    self.textV.frame = CGRM(Px30Distance, Px30Distance, kScreenWidth - Px30Distance * 2, currentTextVH);
    // 新增圖片按鈕
    self.imageBtn.frame = CGRM(Px30Distance, CGRectGetMaxY(self.textV.frame) + litleMargin, imageBtnWH, imageBtnWH);
    // 檔案按鈕
    self.fileBtn.frame = CGRM(Px30Distance,CGRectGetMaxY(self.imageBtn.frame) + litleMargin, kScreenWidth - Px30Distance * 2, fileBtnH);
    // 輸入框背景view
    self.inputView.frame = CGRM(0, currentInputVY, kScreenWidth, inputViewH);
    if (self.fileBtn.hidden == YES) {
        self.scroolV.contentSize = CGSizeMake(kScreenWidth, CGRectGetMaxY(self.imageBtn.frame) + litleMargin);
    }else{
        self.scroolV.contentSize = CGSizeMake(kScreenWidth, CGRectGetMaxY(self.fileBtn.frame) + litleMargin);
    }
    CGFloat offsetY = CGRectGetMaxY(self.imageBtn.frame) + litleMargin - currentInputVY;
    if (offsetY<0) {
        offsetY=0;
    }
    self.scroolV.contentOffset = CGPointMake(0, offsetY);

}

@end

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iOS - 計算UITextView 高度 UIScrollView滾動到具體位置

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