ios中textview的動態高度？

Question

我在UIView中添加了UITextView。 UIView有一些高度取決於屏幕尺寸。 UITextView可以有更多或更少的文字。所以我想讓UITextView的高度動態化，所以如果文字多了，它應該有更多的高度，但它應該小於主視圖的高度。如果文字少，那麼它的高度應該較小。

Answer 1

大小嚐試一個UITextView它的內容編程：

UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)]; 
    [textView setDelegate:self]; 
    [textView setText:@"your long text"]; 
    [textView setScrollEnabled:NO]; 
    [self.view addSubview:textView]; 

    CGFloat fixedWidth = textView.frame.size.width; 
    CGSize newSize = [textView sizeThatFits:CGSizeMake(fixedWidth, MAXFLOAT)]; 
    CGRect newFrame = textView.frame; 
    newFrame.size = CGSizeMake(fmaxf(newSize.width, fixedWidth), newSize.height); 
    textView.frame = newFrame; 

Answer 2

與此

-(void)dynamicTextSize{ 
UITextView *textView = [[UITextView alloc]initWithFrame:CGRectMake(200, 300, 200, 30)]; 
textView.center = self.view.center; 
[self.view addSubview:textView]; 

NSString *string = @"This is pour text.a hjajksdkja kajhdsjk akjdhs jakhd skjahs ajkdhsjkad hskja akjdhs ajkhdjskar"; 
textView.text = string; 

//UIFont *font = [UIFont fontWithName:@"Arial" size:16.0f]; 
NSDictionary *attrDict = [NSDictionary dictionaryWithObjectsAndKeys:textView.font, NSFontAttributeName, nil]; 

textView.backgroundColor = [UIColor lightGrayColor]; 

CGRect frame = [textView.text boundingRectWithSize:CGSizeMake(textView.frame.size.width, 10000) options:NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesLineFragmentOrigin attributes:attrDict context:nil]; 

CGRect mFrame = textView.frame; 
mFrame.size.width = frame.size.width; 
mFrame.size.height = frame.size.height; 
textView.frame = mFrame; 

//NSLog(@"frame2:%@",NSStringFromCGRect(textView.frame)); 
} 

Answer 3

如果使用textview與滾動禁用顯示文本的多線，它只不過是一個UILabel更。我建議你爲此目的使用UILabel。

在情節串連圖板，設置的約束如下：

並設置換行符作爲自動換：

Answer 4

同第一個答案，但在夫特4：

let screenSize = UIScreen.main.bounds 
let textView = UITextView.init(frame: CGRect(x: 1, y: 40, width: screenSize.width, height: screenSize.height)) 
textView.delegate = self as? UITextViewDelegate 
textView.isScrollEnabled = false 
view.addSubview(textView) 

let fixedWidth = textView.frame.size.width 
let newSize: CGSize = textView.sizeThatFits(CGSize(width: fixedWidth, height: CGFloat(MAXFLOAT))) 
var newFrame = textView.frame 
newFrame.size = CGSize(width: CGFloat(fmaxf(Float(newSize.width), Float(fixedWidth))), height: newSize.height)