IOS开发---菜鸟学习之路--（十五）-如何实现拍照功能

本章将来讲解下如何实现拍照的功能

我们需要的实现的效果是

    

好了 直接开始内容吧

首先我们需要新建一个ViewController

就叫AddPictureViewController

然后选择.h文件进行如下修改

 #import <UIKit/UIKit.h>
 
 @interface AddPictureViewController : UIViewController<UIImagePickerControllerDelegate,UINavigationControllerDelegate,UIAlertViewDelegate>
 {
     UITextView *contenttextview;
     UIImageView *contentimageview;
     NSString *lastChosenMediaType;
 
 }
 @property(nonatomic,retain) IBOutlet UITextView *contenttextview;
 @property(nonatomic,retain)  IBOutlet   UIImageView *contentimageview;
 @property(nonatomic,copy)        NSString *lastChosenMediaType;
 -(IBAction)buttonclick:(id)sender;
 
 @end

AddPictureViewController.h

我们需要添加以下两个库

QuartzCore

MobileCoreServices

在项目的General里找到  linked Frameworks and libraries 添加两个类库

然后修改XIB文件

并建立相关链接

最后就是.m文件部分的代码了。

我就直接上代码了 大家可以直接复制过去 然后再理解

 #import "AddPictureViewController.h"
 #import <QuartzCore/QuartzCore.h>
 #import <QuartzCore/CoreAnimation.h>
 #import <MobileCoreServices/UTCoreTypes.h>
 @interface AddPictureViewController ()
 
 @end
 
 @implementation AddPictureViewController
 @synthesize contentimageview;
 @synthesize contenttextview;
 @synthesize lastChosenMediaType;
 - (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 from its nib.
 }
 -(IBAction)buttonclick:(id)sender
 {
     UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"请选择图片来源" message:@"" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"拍照",@"从手机相册选择", nil];
     [alert show];
 }
 - (void)didReceiveMemoryWarning
 {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }
 #pragma 拍照选择模块
 -(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
     if(buttonIndex==)
         [self shootPiicturePrVideo];
     else if(buttonIndex==)
         [self selectExistingPictureOrVideo];
 }
 #pragma  mark- 拍照模块
 //从相机上选择
 -(void)shootPiicturePrVideo{
     [self getMediaFromSource:UIImagePickerControllerSourceTypeCamera];
 }
 //从相册中选择
 -(void)selectExistingPictureOrVideo{
     [self getMediaFromSource:UIImagePickerControllerSourceTypePhotoLibrary];
 }
 #pragma 拍照模块
 -(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
     self.lastChosenMediaType=[info objectForKey:UIImagePickerControllerMediaType];
     if([lastChosenMediaType isEqual:(NSString *) kUTTypeImage])
     {
         UIImage *chosenImage=[info objectForKey:UIImagePickerControllerEditedImage];
         contentimageview.image=chosenImage;
     }
     if([lastChosenMediaType isEqual:(NSString *) kUTTypeMovie])
     {
         UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"提示信息!" message:@"系统只支持图片格式" delegate:nil cancelButtonTitle:@"确认" otherButtonTitles: nil];
         [alert show];
 
     }
     [picker dismissModalViewControllerAnimated:YES];
 }
 -(void) imagePickerControllerDidCancel:(UIImagePickerController *)picker{
     [picker dismissModalViewControllerAnimated:YES];
 }
 -(void)getMediaFromSource:(UIImagePickerControllerSourceType)sourceType
 {
     NSArray *mediatypes=[UIImagePickerController availableMediaTypesForSourceType:sourceType];
     if([UIImagePickerController isSourceTypeAvailable:sourceType] &&[mediatypes count]>){
         NSArray *mediatypes=[UIImagePickerController availableMediaTypesForSourceType:sourceType];
         UIImagePickerController *picker=[[UIImagePickerController alloc] init];
         picker.mediaTypes=mediatypes;
         picker.delegate=self;
         picker.allowsEditing=YES;
         picker.sourceType=sourceType;
         NSString *requiredmediatype=(NSString *)kUTTypeImage;
         NSArray *arrmediatypes=[NSArray arrayWithObject:requiredmediatype];
         [picker setMediaTypes:arrmediatypes];
         [self presentModalViewController:picker animated:YES];
     }
     else{
         UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"错误信息!" message:@"当前设备不支持拍摄功能" delegate:nil cancelButtonTitle:@"确认" otherButtonTitles: nil];
         [alert show];
     }
 }
 static UIImage *shrinkImage(UIImage *orignal,CGSize size)
 {
     CGFloat scale=[UIScreen mainScreen].scale;
     CGColorSpaceRef colorSpace=CGColorSpaceCreateDeviceRGB();
     CGContextRef context=CGBitmapContextCreate(NULL, size.width *scale,size.height*scale, , , colorSpace, kCGImageAlphaPremultipliedFirst);
     CGContextDrawImage(context, CGRectMake(, , size.width*scale, size.height*scale), orignal.CGImage);
     CGImageRef shrunken=CGBitmapContextCreateImage(context);
     UIImage *final=[UIImage imageWithCGImage:shrunken];
     CGContextRelease(context);
     CGImageRelease(shrunken);
     return  final;
 }
 
 @end

AddPictureViewController.m

最后就实现效果了