如何在不調整大小的情況下旋轉UITextView？

Question

我想在我的VC中旋轉一個UITextView。當我嘗試旋轉它時，UITextView會調整其大小？

這是我的代碼。

- (void)viewDidLoad { 

     [super viewDidLoad]; 
     self.edgesForExtendedLayout = UIRectEdgeNone; 

     self.title = @"Signature View"; 

     [self.signatureView setLineWidth:2.0]; 
     self.signatureView.foregroundLineColor = [UIColor colorWithRed:0.204 green:0.596 blue:0.859 alpha:1.000]; 

     NSLog(@"contentsize: %.0f, %.0f", self.view.frame.size.width, self.view.frame.size.height); <-- this is (contentsize: 320, 568) 

     self.howToTextView.frame = CGRectMake(0, 0, self.view.frame.size.height, self.view.frame.size.width); 

     [self.howToTextView setNeedsDisplay]; <-- to make it redraw 

     [self.howToTextView setTransform:CGAffineTransformMakeRotation(-90* M_PI/180)]; 

     NSLog(@"contentsize: %.0f, %.0f", self.howToTextView.contentSize.width, self.howToTextView.contentSize.height); <--- turns out to be (contentsize: 103, 138)same as on storyboard design 

    } 

UPDATE（這段代碼的UITextView的到位和框架是正確的，但不是文本不會調整，填補了uitextviews新的幀的大小及其在底角陷了下去。）：

- (void)viewDidLoad { 

     [super viewDidLoad]; 
     self.edgesForExtendedLayout = UIRectEdgeNone; 

     self.title = @"Signature View"; 

     [self.signatureView setLineWidth:2.0]; 
     self.signatureView.foregroundLineColor = [UIColor colorWithRed:0.204 green:0.596 blue:0.859 alpha:1.000]; 

     NSLog(@"contentsize: %.0f, %.0f", self.view.frame.size.width, self.view.frame.size.height); 

     self.howToTextView = [[UITextView alloc] init]; 
     self.howToTextView.backgroundColor = [UIColor redColor]; 
     self.howToTextView.text = @"this is a good day. i am going to make millions today. Smile while on the phone as it is the best way to increase your business. I hope that you like this app as we have work really hard on it. Please sign your name or decline but if you decline then you understand you lose all coverage."; 

     [self.view addSubview:self.howToTextView]; 


     [self.howToTextView setTransform:CGAffineTransformMakeRotation(-90* M_PI/180)]; 
     self.howToTextView.frame = CGRectMake(0, 0, 80, self.view.frame.size.height); 
     [self.howToTextView setNeedsDisplay]; 

     NSLog(@"contentsize: %.0f, %.0f", self.howToTextView.contentSize.width, self.howToTextView.contentSize.height); 

    } 

更新2：堅持一個UIView內的TextView使得內容大小合適的，但現在有了這個代碼的UITextView/UIView的是在應用程序的右上角，即使我將它們都爲0 ，0代表x，y？不知道這是爲什麼？

 self.howToTextView = [[UITextView alloc] init]; 
     [self.howToTextView setFrame:CGRectMake(0, 0, self.view.frame.size.height-20, 110)]; 
     self.howToTextView.backgroundColor = [UIColor redColor]; 
     self.howToTextView.text = @"this is a good day. i am going to make millions today. Smile while on the phone as it is the best way to increase your business. I hope that you like this app as we have work really hard on it. Please sign your name or decline but if you decline then you understand you lose all coverage."; 

     UIView *myRotateView = [[UIView alloc] init]; 
     [myRotateView setFrame:CGRectMake(0, 0, self.view.frame.size.height, 120)]; 
     [myRotateView setBackgroundColor:[UIColor greenColor]]; 
     [myRotateView addSubview:self.howToTextView]; 

     myRotateView.transform = CGAffineTransformMakeRotation(-90* M_PI/180); 
     [[self view] addSubview:myRotateView]; 

Answer 1

掙扎後兩天，我發現了一個解決辦法：

1. 創建一個UIView。
2. 將你的UITextView作爲子視圖添加到它。
3. 使用sizeThatFits（）獲取適當大小的UITextView。
4. 設置UITextView框架。
5. 設置0高度和0寬度的UIView幀（這很重要！）。
6. 旋轉你的UIView。

現在，如果你想改變字體大小做這樣的：

myTextView.font = UIFont.boldSystemFontOfSize(size) 
let maxsize = CGSizeMake(SCREEN_WIDTH, SCREEN_HEIGHT) 
let frame = myTextView.sizeThatFits(maxsize) 
myTextView.frame = CGRectMake(0, 0, frame.width, frame.height) 

年末再次旋轉的UIView。