应用中的代码：
[imageview setAlpha:1.0f];
[imageview setImage:[UIImage imageNamed:[NSString stringWithFormat:@"%@.png",[pages objectAtIndex:swipeCount]]]];
[imageview setFrame:CGRectMake(-300, 0, 1368, 1000)];
初始化：
pages = [[NSArray alloc] initWithObjects:@"page1",@"page2",@"page3",@"page4",@"page5",@"page6",@"page7b",@"page8",@"page9",@"page10a",@"page11",@"page12",@"page13b",@"page14",@"page15",@"page16a",@"page17",@"page18",@"page19",@"page20",@"page21",@"page22",@"page23",@"page24",@"page25", nil];
imageview=[[UIImageView alloc]init];
基本运行正常，只有一个问题，就是应用隐入后台在由前台出现时会出现以下错误：
*** -[UIImage isKindOfClass:]: message sent to deallocated instance 0x1e8b10
