iOS Label随字自动变大效果

- (void)viewDidLoad
{
 [super viewDidLoad];
 // Do any additional setup after loading the view.
 
 
 
 textView = [[HPGrowingTextView alloc] initWithFrame:CGRectMake(10, 100, 240, 40)];
 textView.isScrollable = NO;
 textView.contentInset = UIEdgeInsetsMake(0, 5, 0, 5);
 textView.minNumberOfLines = 1;
 textView.maxNumberOfLines = 6;
 // you can also set the maximum height in points with maxHeight
 // textView.maxHeight = 200.0f;
 textView.returnKeyType = UIReturnKeyGo; //just as an example
 textView.font = [UIFont systemFontOfSize:15.0f];
 textView.delegate = self;
 textView.internalTextView.scrollIndicatorInsets = UIEdgeInsetsMake(5, 0, 5, 0);
 textView.backgroundColor = [UIColor greenColor];
 textView.placeholder = @"Type to see the textView grow!";
 [self.view addSubview:textView];
 
 
 
 
}