add view method

method 1: with interface builder

1. create a subclass of UIView: newView

2. create a view xib: newView.xib

3. In IB, set view's class as newView

4. In xCode, add new view

NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"newView" owner: self

options:nil];

UIView *view = [nib objectAtIndex: 1];

[self.view addSubview:view];

note: use the index for array of nib to get specific object, such as view

method 2: all within xCode:

CGRect newViewFrame = CGRectMake(0, 0, 50, 50);

UIView *newView = [[UIView alloc] initWithFrame:newViewFrame];

newView.backgroundColor = [UIColor blueColor];

[self.view addSubview:newView];