How to change the uitextview font size

can any one help to change the font size in UITextView.

[textView setFont:[UIFont fontWithName:@"ArialMT" size:30]];

I use this one but it doesn't work.

Have you bind textView with xib or allocated textView?

If yes,

You can use following code to check whether this works

[textView setFont:[UIFont boldSystemFontOfSize:15]];

 [textView setFont:[UIFont systemFontOfSize:15]];

Check, if "Selectable" is checked in the xib/Storyboard attribute inspector. If it's not selectable, the size wont be changed

Swift 4.0

textField.font = UIFont.systemFont(ofSize: 17.0)

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