UITextView * textView = [[UITextView alloc] init];

1、设置内边距

// 设置上、左、下

textView.textContainerInset = UIEdgeInsetsMake(0, 15, 0, 15);// 设置底部边距

textView.contentInset = UIEdgeInsetsZero;

2、左侧顶格显示/输入内容

textView.textContainer.lineFragmentPadding = 0;

3、 防止拼音打字时抖动

textView.layoutManager.allowsNonContiguousLayout = NO;

4、编辑状态下的行间距

textView.typingAttributes = @{NSFontAttributeName : font, NSParagraphStyleAttributeName : style};

5、修改行间距会出现光标size变长的问题

通过继承 UITextView，重写 caretRectForPosition: 

- (CGRect)caretRectForPosition:(UITextPosition *)position {

    CGRect originalRect = [super caretRectForPosition:position];

    originalRect.size.height = self.font.lineHeight + 2;

    return originalRect;

}