- (void)sizeToFitDemo
{
UIView * whiteView = [[UIView alloc] initWithFrame:CGRectMake(10, 40, 90, 90)];
whiteView.backgroundColor = [UIColor whiteColor];
UILabel * label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 70, 20)];
label.backgroundColor = [UIColor redColor];
label.text = @"kkjkjkkjkjkjkjjkjkjkjjkjkkjkjkjkjk2222222222222";
[whiteView addSubview:label];
NSLog(@"the label bounds : %@", NSStringFromCGRect(label.frame));
[label sizeToFit];
NSLog(@"the label bounds : %@", NSStringFromCGRect(label.frame));
[self.window addSubview:whiteView];
}