A useful UITextView subclass

gistfile1.m

// From https://github.com/Nikita2k/resizableTextView

#import <UIKit/UIKit.h>

// ---------------------------------------
@interface ResizableTextView : UITextView
@end


// ---------------------------------------
@implementation ResizableTextView

- (void) updateConstraints {

    // calculate contentSize manually
    // ios7 doesn't calculate it before viewDidAppear and we'll get here before
    CGSize contentSize = [self sizeThatFits:CGSizeMake(self.frame.size.width, FLT_MAX)];
    
    // set the height constraint to change textView height
    [self.constraints enumerateObjectsUsingBlock:^(NSLayoutConstraint *constraint, NSUInteger idx, BOOL *stop) {
        if (constraint.firstAttribute == NSLayoutAttributeHeight) {
            constraint.constant = contentSize.height;
            *stop = YES;
        }
    }];
    
    [super updateConstraints];
}

- (void)setContentOffset:(CGPoint)contentOffset
{
    // In iOS 8 we seem to be inheriting the content offset from the parent.
    // I'm not interested!
    // This is the "do nothing" override.
}

@end