IOS UITextView 光标的位置，大小，宽度，高度设置问题

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/**
 *  鼠标的相关设置
 *
 *  @param position <#position description#>
 *
 *  @return <#return value description#>
 */
- (CGRect)caretRectForPosition:(UITextPosition *)position {
    CGRect originalRect = [super caretRectForPosition:position];
    originalRect.size.height = 19;
    originalRect.size.width = 2;
    originalRect.origin.y = 8;
    originalRect.origin.x = 0;
    return originalRect;
}