iOS11 UITextField leftView失效问题解决

iOS13的bug 直接用imageView会有问题，应该是textFiled布局的时候imageView还没有创建的关系，外层用UIView包一下就行了。

- (void)addLeftView:(UITextField*)textField{

    UIView*leftView = [[UIViewalloc]initWithFrame:CGRectMake(0,0,10, textField.frame.size.height)];

    UIImageView*leftImage = [[UIImageViewalloc]initWithImage:[UIImageimageNamed:@"image"]];

    leftImage.frame=CGRectMake(0,10,10,textField.frame.size.height));

    [leftViewaddSubview:leftImage];

    textField.leftView= leftView;

    textField.leftViewMode = UITextFieldViewModeAlways;

}