iOS Learning Uiscrollview

first, the creation of Uiscrollview and Common Properties1. Uiscrollview Overview

• Uiscrollview is a subclass of UIView.
• Uiscrollview as the base class for all scrolling views.
• Uiscrollview is mainly used in common functions such as rolling headlines (Carousel charts), photo albums, etc.
  

2, the creation of Uiscrollview

    #define kwidth self.frame.size.width    #define kheight self.frame.size.height    // Create a Uiscrollview        with the same screen size Self.scrollview = [[Uiscrollview alloc] Initwithframe:cgrectmake (00, Kwidth, Kheight)];     //  Set background color        self.scrollView.backgroundColor = [Uicolor yellowcolor];     // Add to Parent view        [Self addSubview:self.scrollView];

3. Contentsize Scrolling Range

• Uiscrollview is used to control the scrolling range of important properties contentsize, through this important property setting to control the scrolling of the view, we target to lay 3 screen width of the picture, so we set the scrolling range is 3 screen width
• Contentsize has two parameters, one is width and the other is height, setting two values with different effects

// Scroll Horizontally 3 0 ); // Scroll in the vertical direction
Self.scrollView.contentSize = Cgsizemake (03);  

4. Properties of Uiscrollview

//after setting the scroll range for the Uiscrollview, then tile 3 pictures in ScrollView with a for loop, noting the location of each ImageView for(Nsinteger i =1; I <4; i++) {Uiimageview*imageview = [[Uiimageview alloc] Initwithframe:cgrectmake ((I-1) * Kwidth,0, Kwidth, Kheight)]; Imageview.image= [UIImage imagenamed:[nsstring stringwithformat:@ "h%d.jpg ", I]]; [ScrollView Addsubview:imageview];} //The offset setting allows the specified view to be displayed (which picture will be displayed first)//directly set the second view to appear on the screenSelf.scrollView.contentOffset = Cgpointmake (Kwidth,0); //Allows scrollview to scroll by pageself.scrollView.pagingEnabled =YES;//Turn off horizontal scroll barsSelf.scrollView.showsHorizontalScrollIndicator =NO;//Turn off vertical scroll barsSelf.scrollView.showsVerticalScrollIndicator =NO;//turn off the bounding rebound effectSelf.scrollView.bounces =NO;//set a Tag valueSelf.scrollView.tag =101; //If you want to have a horizontal or vertical rebound effect scrollview scrolling range needs to be set to screen sizeSelf.scrollView.alwaysBounceHorizontal =YES; Self.scrollView.alwaysBounceVertical= YES;

• Ii. the protocol method of Uiscrollview

1. Uiscrollview protocol Method

• The first is to monitor the state of the scrolling time.
• The second is to control the zoom of the view.

2.

• Trigger Order: Begindragging->didenddragging->begindecelerating->didenddecelerating

3. Control the zoom of the view

// set the maximum scale for scaling 2  //  Set the minimum scale for scaling 0.5//  Set the current scale to 1;

• When we set the maximum and minimum scale in the Viewdidload method, we can zoom on the view.

Three, Uiscrollview and Uipageco ntrol combination of Use

iOS Learning Uiscrollview