#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@end

#import "AppDelegate.h"

#import "RootViewController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    // Override point for customization after application launch.

    self.window.backgroundColor = [UIColor whiteColor];

    UINavigationController *root = [[UINavigationController alloc] initWithRootViewController:[[RootViewController alloc] init]];

    self.window.rootViewController = root;

    [self.window makeKeyAndVisible];

    return YES;

}

@end

#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController

@end

#import "RootViewController.h"

@interface RootViewController ()<UIActionSheetDelegate,UIImagePickerControllerDelegate,UINavigationControllerDelegate>

@property (strong, nonatomic) UIButton *btn;

@end

@implementation RootViewController

@synthesize btn;

- (void)loadView

{

    [super loadView];

    btn= [UIButton buttonWithType:UIButtonTypeCustom];

    btn.frame = CGRectMake(, , , );

    btn.backgroundColor = [UIColor purpleColor];

    [btn addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:btn];

}

- (void)btnAction:(UIButton *)sender

{

    UIActionSheet *actionsheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"从手机相册选取", nil];

    [actionsheet showInView:self.view];

}

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex

{

    if (buttonIndex == ) {

        UIImagePickerController *imagepicker = [[UIImagePickerController alloc] init];

        imagepicker.delegate = self;

        imagepicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

        imagepicker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

        imagepicker.allowsEditing = YES;

        [self presentViewController:imagepicker animated:YES completion:^{}];

    }

}

#pragma amrk - 图片选择完成 -

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo

{

    [picker dismissViewControllerAnimated:YES completion:^{

        [btn setImage:image forState:];

    }];

}

@end