Center the text in a UITextView, vertically and horizontally [duplicate] - ios

Question

This question already has answers here:
Center text vertically in a UITextView
(19 answers)
Closed 7 years ago.
I have a grouped table view with one cell. In this cell I'm putting a UITextView in cellForRowAtIndexPath:, and I instantly make this first Responder.
My problem is: When I start typing, the text is left-justified, not centered horizontally and vertically as I want. This is on iOS 7.
How can I center the text?

Answer 1

I resolve this issue by observing the contentsize of UITextView, when there is any change in the contentSize, update the contentOffset.
Add observer as follows:
[textview addObserver:self forKeyPath:#"contentSize" options:(NSKeyValueObservingOptionNew) context:NULL];
Handle the observer action as follows:
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
UITextView *txtview = object;
CGFloat topoffset = ([txtview bounds].size.height - [txtview contentSize].height * [txtview zoomScale])/2.0;
topoffset = ( topoffset < 0.0 ? 0.0 : topoffset );
txtview.contentOffset = (CGPoint){.x = 0, .y = -topoffset};
}
To make the textview text horizontally center, select the textview from .xib class and go to the library and in that set Alignment as center.
Enjoy. :)

Answer 2

Very good solution! This is a Swift + Interface Builder solution so that you can enable it in IB.
I'll put it as part of the LSwift library.
extension UITextView {
#IBInspectable var align_middle_vertical: Bool {
get {
return false // TODO
}
set (f) {
self.addObserver(self, forKeyPath:"contentSize", options:.New, context:nil)
}
}
override public func observeValueForKeyPath(keyPath: String, ofObject object: AnyObject, change: [NSObject:AnyObject], context: UnsafeMutablePointer<Void>) {
if let textView = object as? UITextView {
var y: CGFloat = (textView.bounds.size.height - textView.contentSize.height * textView.zoomScale)/2.0;
if y < 0 {
y = 0
}
textView.content_y = -y
}
}
}
public extension UIScrollView {
public var content_x: CGFloat {
set(f) {
contentOffset.x = f
}
get {
return contentOffset.x
}
}
public var content_y: CGFloat {
set(f) {
contentOffset.y = f
}
get {
return contentOffset.y
}
}
}