IPhone4 Startup Map Deformed!

  ios, question

When I was making the map page, I got the height and width of the screen to create the size of the picture. why did the picture have no problem on 5 6 and 6plus, and changed on 4 and 4s?
– (void)makeInitialPage
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CGSize screenSize = [UIScreen mainScreen].bounds.size;
CGFloat contentWidth = screenSize.width * 4;
CGFloat contentHeight = screenSize.height;

self.scrollView.contentSize = CGSizeMake(contentWidth, contentHeight);
 for (int i = 0;   i < 4;  I plus)
 Uiimageview * temp = [[uiimageviewalloc] initthimage: [uiimageimagenamed: [nsstringstringwithformat: @ "percentage d", i]];
 CGRect pageFrame = CGRectMake(i * screenSize.width, 0, screenSize.width, screenSize.height);
 temp.frame = pageFrame;
 [self.scrollView addSubview:temp];
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The Adaptation of iphone4s and Apple iphone5 in ios7.1 Version
Let’s see if this is the reason. Because I have encountered this problem twice, ios7’s launchscreen image needs to be set.