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

 1 #import <UIKit/UIKit.h>
 2 
 3 @interface AddPictureViewController : UIViewController<UIImagePickerControllerDelegate,UINavigationControllerDelegate,UIAlertViewDelegate>
 4 {
 5     UITextView *contenttextview;
 6     UIImageView *contentimageview;
 7     NSString *lastChosenMediaType;
 8 
 9 }
10 @property(nonatomic,retain) IBOutlet UITextView *contenttextview;
11 @property(nonatomic,retain)  IBOutlet   UIImageView *contentimageview;
12 @property(nonatomic,copy)        NSString *lastChosenMediaType;
13 -(IBAction)buttonclick:(id)sender;
14 
15 @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

  1 #import "AddPictureViewController.h"
  2 #import <QuartzCore/QuartzCore.h>
  3 #import <QuartzCore/CoreAnimation.h>
  4 #import <MobileCoreServices/UTCoreTypes.h>
  5 @interface AddPictureViewController ()
  6 
  7 @end
  8 
  9 @implementation AddPictureViewController
 10 @synthesize contentimageview;
 11 @synthesize contenttextview;
 12 @synthesize lastChosenMediaType;
 13 - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
 14 {
 15     self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
 16     if (self) {
 17         // Custom initialization
 18     }
 19     return self;
 20 }
 21 
 22 - (void)viewDidLoad
 23 {
 24     [super viewDidLoad];
 25     // Do any additional setup after loading the view from its nib.
 26 }
 27 -(IBAction)buttonclick:(id)sender
 28 {
 29     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];
 30     [alert show];
 31 }
 32 - (void)didReceiveMemoryWarning
 33 {
 34     [super didReceiveMemoryWarning];
 35     // Dispose of any resources that can be recreated.
 36 }
 37 #pragma 拍照选择模块
 38 -(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
 39     if(buttonIndex==1)
 40         [self shootPiicturePrVideo];
 41     else if(buttonIndex==2)
 42         [self selectExistingPictureOrVideo];
 43 }
 44 #pragma  mark- 拍照模块
 45 //从相机上选择
 46 -(void)shootPiicturePrVideo{
 47     [self getMediaFromSource:UIImagePickerControllerSourceTypeCamera];
 48 }
 49 //从相册中选择
 50 -(void)selectExistingPictureOrVideo{
 51     [self getMediaFromSource:UIImagePickerControllerSourceTypePhotoLibrary];
 52 }
 53 #pragma 拍照模块
 54 -(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
 55     self.lastChosenMediaType=[info objectForKey:UIImagePickerControllerMediaType];
 56     if([lastChosenMediaType isEqual:(NSString *) kUTTypeImage])
 57     {
 58         UIImage *chosenImage=[info objectForKey:UIImagePickerControllerEditedImage];
 59         contentimageview.image=chosenImage;
 60     }
 61     if([lastChosenMediaType isEqual:(NSString *) kUTTypeMovie])
 62     {
 63         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];
 64         [alert show];
 65         
 66     }
 67     [picker dismissModalViewControllerAnimated:YES];
 68 }
 69 -(void) imagePickerControllerDidCancel:(UIImagePickerController *)picker{
 70     [picker dismissModalViewControllerAnimated:YES];
 71 }
 72 -(void)getMediaFromSource:(UIImagePickerControllerSourceType)sourceType
 73 {
 74     NSArray *mediatypes=[UIImagePickerController availableMediaTypesForSourceType:sourceType];
 75     if([UIImagePickerController isSourceTypeAvailable:sourceType] &&[mediatypes count]>0){
 76         NSArray *mediatypes=[UIImagePickerController availableMediaTypesForSourceType:sourceType];
 77         UIImagePickerController *picker=[[UIImagePickerController alloc] init];
 78         picker.mediaTypes=mediatypes;
 79         picker.delegate=self;
 80         picker.allowsEditing=YES;
 81         picker.sourceType=sourceType;
 82         NSString *requiredmediatype=(NSString *)kUTTypeImage;
 83         NSArray *arrmediatypes=[NSArray arrayWithObject:requiredmediatype];
 84         [picker setMediaTypes:arrmediatypes];
 85         [self presentModalViewController:picker animated:YES];
 86     }
 87     else{
 88         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];
 89         [alert show];
 90     }
 91 }
 92 static UIImage *shrinkImage(UIImage *orignal,CGSize size)
 93 {
 94     CGFloat scale=[UIScreen mainScreen].scale;
 95     CGColorSpaceRef colorSpace=CGColorSpaceCreateDeviceRGB();
 96     CGContextRef context=CGBitmapContextCreate(NULL, size.width *scale,size.height*scale, 8, 0, colorSpace, kCGImageAlphaPremultipliedFirst);
 97     CGContextDrawImage(context, CGRectMake(0, 0, size.width*scale, size.height*scale), orignal.CGImage);
 98     CGImageRef shrunken=CGBitmapContextCreateImage(context);
 99     UIImage *final=[UIImage imageWithCGImage:shrunken];
100     CGContextRelease(context);
101     CGImageRelease(shrunken);
102     return  final;
103 }
104 
105 @end

AddPictureViewController.m

最后就实现效果了