Scroll through the scrollView loop --- the last image is followed by the first image. The first image is followed by the last image.

Scroll through the scrollView loop --- the last image is followed by the first image. The first image is followed by the last image.

Problem description: scrollView-the last image is followed by the first image. The first image is placed in front of the last image to form a ring and switch the image cyclically. As follows:
The Code is as follows:

// ViewController. m

# Import "ViewController. h"

# Define kW 375

# Define kH 500

# Define kCount 11

@ Interface ViewController () <UIScrollViewDelegate>

@ End

@ Implementation ViewController

-(Void) viewDidLoad {

[SuperviewDidLoad];

// Load the scroll View

[Self_loadScroll];

}

-(Void) _ loadScroll

{

UIScrollView * scrollView = [[UIScrollViewalloc] initWithFrame: CGRectMake (0, kW, kH)];

ScrollView. delegate = self;

For (int I = 0; I <kCount + 2; I ++)

{

UIImageView * imageView = [[UIImageViewalloc] initWithFrame: CGRectMake (I * kW, 0, kW, kH)];

// Image serial number

Int imageIndex = I;

// Special processing is required for the first and last images.

If (I = 0)

{

ImageIndex = kCount;

}

Else if (I = kCount + 1)

{

ImageIndex = 1;

}

// Add an image

NSString * imgName = [NSStringstringWithFormat: @ "tpolici.jpg", imageIndex];

ImageView. image = [UIImageimageNamed: imgName];

[ScrollViewaddSubview: imageView];

}

ScrollView. contentSize = CGSizeMake (kCount + 2) * kW, kH); // The total width of the scrolling View

ScrollView. showsHorizontalScrollIndicator = NO; // progress bar NO at the bottom -- hide YES --- display

ScrollView. pagingEnabled = YES; // slide the width of the entire Screen

[Self. viewaddSubview: scrollView];

}

# Pragma mark-UIScrollView proxy method implementation

-(Void) scrollViewDidEndDecelerating :( UIScrollView *) scrollView

{

If (scrollView. contentOffset. x/kW = kCount + 1)

{

NSLog (@ "===="); // test code

ScrollView. contentOffset = CGPointMake (kW, 0 );

}

Else if (scrollView. contentOffset. x = 0)

{

ScrollView. contentOffset = CGPointMake (kW * kCount, 0 );

}

// If (scrollView. contentOffset. x> (kCount + 1) * kW)

//{

// ScrollView. contentOffset = CGPointMake (kW, 0 );

//}

// Else if (scrollView. contentOffset. x/kW = 0)

//{

// ScrollView. contentOffset = CGPointMake (kW * kCount, 0 );

//}

}

@ End

Disadvantages: reuse is not implemented, too much memory is consumed, and the optimized program will continue to be uploaded after modification. Please wait ..... PS: I feel like I cannot find any direction recently, but I am still sticking to it. I hope I can reach the end. Come on, friends!