iOS 7 UITextView vertical alignment

Question

How is that possible that my editable UITextView (placed inside a straightforward UIViewController inside a UISplitView that acts as delegate for t

Answer 1

This is a fairly common problem, so I would create a simple UITextView subclass, so that you can re-use it and use it in IB.

I would used the contentInset instead, making sure to gracefully handle the case where the contentSize is larger than the bounds of the textView

@interface BSVerticallyCenteredTextView : UITextView

@end

@implementation BSVerticallyCenteredTextView

- (id)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame])
    {
        [self addObserver:self forKeyPath:@"contentSize" options:  (NSKeyValueObservingOptionNew) context:NULL];
    }
    return self;
}

- (id)initWithCoder:(NSCoder *)aDecoder
{
    if (self = [super initWithCoder:aDecoder])
    {
        [self addObserver:self forKeyPath:@"contentSize" options:  (NSKeyValueObservingOptionNew) context:NULL];
    }
    return self;
}

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    if ([keyPath isEqualToString:@"contentSize"])
    {
        UITextView *tv = object;
        CGFloat deadSpace = ([tv bounds].size.height - [tv contentSize].height);
        CGFloat inset = MAX(0, deadSpace/2.0);
        tv.contentInset = UIEdgeInsetsMake(inset, tv.contentInset.left, inset, tv.contentInset.right);
    }  
}

- (void)dealloc
{
    [self removeObserver:self forKeyPath:@"contentSize"];
}

@end