UIScrollView common attributes and uiscrollview attributes

UIScrollView common attributes and uiscrollview attributes
What is UIScrollView • the screen size of the device is extremely limited, so the content displayed directly in front of the user is quite limited • when there is more content than one screen, you can use a scroll gesture to view content outside the screen • a normal UIView does not have the scroll function and cannot display too much content • UIScrollView is a view control that can be rolled, it can be used to display a large amount of content, and you can scroll to view all the content

 

• Example: "Settings" and other sample programs on the mobile phone • If UIScrollView cannot be rolled, it may be due to the following: userInteractionEnabled = NO. The autolayout function is not canceled (autolayout must be canceled for scrollView scrolling ...... Common UIScrollView attributes • @ property (nonatomic) CGPoint contentOffset; Ø this attribute is used to indicate the scroll position of UIScrollView

 

• @ Property (nonatomic) CGSize contentSize; Ø this attribute is used to indicate the size of UIScrollView content and the scroll range (how far can it be rolled) • @ property (nonatomic) UIEdgeInsets contentInset; this attribute can be implemented by adding additional code for the rolling area in four weeks of UIScrollView.

Main. storyboard

If you add a button here, it cannot be added to Scoll View.

# Import "ViewController. h"

 

@ Interface ViewController ()

@ Property (weak, nonatomic) IBOutlet UIScrollView * scrollView;

@ Property (weak, nonatomic) IBOutlet UIImageView * imageView;

-(IBAction) btn;

 

@ End

 

@ Implementation ViewController

 

-(Void) viewDidLoad {

[Super viewDidLoad];

// Scroll range

Self. scrollView. contentSize = self. imageView. frame. size;

// Scroll margin

Self. scrollView. contentInset = UIEdgeInsetsMake (10, 20, 30, 40 );

}

 

-(Void) didReceiveMemoryWarning {

[Super didReceiveMemoryWarning];

}

 

-(IBAction) btn {

// Center Coordinate

CGPoint offest = CGPointMake (100,100 );

// CGPoint offest = self. scrollView. contentOffset;

// Offest. x ++ = 100;

// Offest. y + = 100;

[Self. scrollView setContentOffset: offest animated: YES];

}

@ End