【代码笔记】iOS-旋转的图片

一，效果图。

二，工程图。

三，代码。

AppDelegate.h

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@end

AppDelegate.m

#import "AppDelegate.h"
#import "RootViewController.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.

    RootViewController *rootVC=[[RootViewController alloc]init];
    UINavigationController *nav=[[UINavigationController alloc]initWithRootViewController:rootVC];
    self.window.rootViewController=nav;

    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}

RootViewController.h

#import <UIKit/UIKit.h>

@class MainPageView;
@interface RootViewController : UIViewController
{
    MainPageView* mainPageView;
}
@property (nonatomic,retain) MainPageView* mainPageView;
@end

RootViewController.m

#import "RootViewController.h"
//加入头文件
#import "MainPageView.h"

@interface RootViewController ()

@end

@implementation RootViewController
@synthesize mainPageView;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    mainPageView = [[MainPageView alloc] initWithFrame:CGRectMake(0, 20, 320, 460)];
    mainPageView.backgroundColor = [UIColor lightGrayColor];
    [mainPageView initDrawViewData];
    self.view = mainPageView;

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}