The answer given by @Gabe doesn't work in iOS7.1 seemingly until after viewDidAppear. See my tests below.
UPDATE: Actually, the situation is even more complicated. If you assign textView.text in the resizeTheTextView method, in iOS7, the resizing amounts to allowing for only a single line of text. Seriously odd.
UPDATE2: See also UITextView content size different in iOS7
UPDATE3: See my code at the very bottom for what I'm using now. Seems to do the job.
#import "ViewController.h"
@interface ViewController ()
{
UITextView *textView;
}
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
textView = [[UITextView alloc] initWithFrame:CGRectMake(50, 50, 200, 1)];
[self.view addSubview:textView];
CALayer *layer = textView.layer;
layer.borderColor = [UIColor blackColor].CGColor;
layer.borderWidth = 1;
textView.text = @"hello world\n\n";
// Calling the method directly, after the view is rendered, i.e., after viewDidAppear, works on both iOS6.1 and iOS7.1
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:@"Change size" forState:UIControlStateNormal];
[button addTarget:self action:@selector(resizeTheTextView) forControlEvents:UIControlEventTouchUpInside];
[button sizeToFit];
CGRect frame = button.frame;
frame.origin.y = 400;
button.frame = frame;
[self.view addSubview:button];
// Works on iOS6.1, but does not work on iOS7.1
//[self resizeTheTextView];
}
- (void) viewWillAppear:(BOOL)animated
{
// Does not work on iOS7.1, but does work on iOS6.1
//[self resizeTheTextView];
}
- (void) viewDidAppear:(BOOL)animated
{
// Does work on iOS6.1 and iOS7.1
//[self resizeTheTextView];
}
- (void) resizeTheTextView
{
NSLog(@"textView.frame.size.height: %f", textView.frame.size.height);
NSLog(@"textView.contentSize.height: %f", textView.contentSize.height);
// 5) From https://stackoverflow.com/questions/728704/resizing-uitextview
CGRect frame = textView.frame;
UIEdgeInsets inset = textView.contentInset;
frame.size.height = textView.contentSize.height + inset.top + inset.bottom;
textView.frame = frame;
NSLog(@"inset.top: %f, inset.bottom: %f", inset.top, inset.bottom);
NSLog(@"textView.frame.size.height: %f", textView.frame.size.height);
NSLog(@"textView.contentSize.height: %f", textView.contentSize.height);
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
UPDATE3:
if ([[UIDevice currentDevice] majorVersionNumber] < 7.0) {
CGRect frame = _abstractTextView.frame;
UIEdgeInsets inset = _abstractTextView.contentInset;
frame.size.height = _abstractTextView.contentSize.height + inset.top + inset.bottom;
_abstractTextView.frame = frame;
}
else {
CGSize textViewSize = [_abstractTextView sizeThatFits:CGSizeMake(_abstractTextView.frame.size.width, FLT_MAX)];
_abstractTextView.frameHeight = textViewSize.height;
}
