ImagePIckerController

图片选取器:
通常用于照片的选取或者视频的选取,
继承与UINavigationController,所以也可以使用push
和 pop
的一些视图控制器切换效果.

iOS 获取图片有三种方法：

1. 直接调用摄像头拍照(拍照时,
需要手动将照片保存到本地,
系统不会自动保存成功后的照片)

2. 从相册中选择

3. 从图库中选择

UIImagePickerController 是系统提供的用来获取图片和视频的接口；

用UIImagePickerController
类来获取图片视频，大体分为以下几个步骤：

1. 初始化UIImagePickerController
类；

2. 设置UIImagePickerController
实例的数据来源类型；

3. 设置设置代理；

4. 如果需要做图片修改的话设置allowsEditing =yes。

一
使用步骤:

1: 实例化图像选取器对象

UIImagePickerController* imagePickerController = [[UIImagePickerController alloc] init]

2: 判断当前设配支持的数据来源

用这些数据来源的时候需要进行检测设备是否支持数据

if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])

{

NSLog(@"支持相机");

}

if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary])

{

NSLog(@"支持图库");

}

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum])

{

NSLog(@"支持相片库");

}

3: 通过上一步获取当前设配支持的数据来源,
设置我们需要的数据来源

数据来源类型:
一共三种

enum {

UIImagePickerControllerSourceTypePhotoLibrary ,// 照片库模式。图像选取控制器以该模式显示时会浏览系统照片库的根目录。

UIImagePickerControllerSourceTypeCamera ,// 相机模式，图像选取控制器以该模式显示时可以进行拍照或摄像

UIImagePickerControllerSourceTypeSavedPhotosAlbum // 相机胶卷模式，图像选取控制器以该模式显示时会浏览相机胶卷目录

};

4: 检查支持的媒体来源类型

调用UIImagePickerController类的另一个静态方法
availableMediaTypesForSourceType:

返回的是字符串数组，kUTTypeImage表示静态图片，kUTTypeMovie表示视频。这两个字符串常量定义在MobileCoreServices框架中。

5: 实现代理方法
完成图片的选取

协议方法:

当用户取消完成后调用此方法

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker;

当用户选取完成时调用此方法,
选取的信息都在info中,
info 是一个字典,
其关键字如下

- (void)imagePickerController:(UIImagePickerController *)picker

didFinishPickingMediaWithInfo:(NSDictionary *)info;

调用摄像头来获取资源

NSString *const UIImagePickerControllerMediaType ;指定用户选择的媒体类型（文章最后进行扩展）

NSString *const UIImagePickerControllerOriginalImage ;原始图片

NSString *const UIImagePickerControllerEditedImage ;修改后的图片

NSString *const UIImagePickerControllerCropRect ;裁剪尺寸

NSString *const UIImagePickerControllerMediaURL ;媒体的URL

NSString *const UIImagePickerControllerReferenceURL ;原件的URL

NSString *const UIImagePickerControllerMediaMetadata;当来数据来源是照相机的时候这个值才有效

KUTTypeImage

const CFStringRef kUTTypeImage ;抽象的图片类型

const CFStringRef kUTTypeJPEG ;

const CFStringRef kUTTypeJPEG2000 ;

const CFStringRef kUTTypeTIFF ;

const CFStringRef kUTTypePICT ;

const CFStringRef kUTTypeGIF ;

const CFStringRef kUTTypePNG ;

const CFStringRef kUTTypeQuickTimeImage ;

const CFStringRef kUTTypeAppleICNS

const CFStringRef kUTTypeBMP;

const CFStringRef kUTTypeICO;

KUTTypeMovie 包含 :

const CFStringRef kUTTypeAudiovisualContent ;抽象的声音视频

const CFStringRef kUTTypeMovie ;抽象的媒体格式（声音和视频）

const CFStringRef kUTTypeVideo ;只有视频没有声音

const CFStringRef kUTTypeAudio ;只有声音没有视频

const CFStringRef kUTTypeQuickTimeMovie ;

const CFStringRef kUTTypeMPEG ;

const CFStringRef kUTTypeMPEG4 ;

const CFStringRef kUTTypeMP3 ;

const CFStringRef kUTTypeMPEG4Audio ;

const CFStringRef kUTTypeAppleProtectedMPEG4Audio;

二
扩展应用:

常用属性详解:

//指定使用照相机模式,可以指定使用相册／照片库

imagepicker.sourceType = UIImagePickerControllerSourceTypeCamera;

//设置当拍照完或在相册选完照片后，是否跳到编辑模式进行图片剪裁。只有当showsCameraControls属性为true时才有效果

imagepicker.allowsEditing = YES;

canera 相关的属性方法

//所有含有cameraXXX的属性都必须要sourceType是UIImagePickerControllerSourceTypeCamera时设置才有效果，否则会有异常

//设置拍照时的下方的工具栏是否显示，如果需要自定义拍摄界面，则可把该工具栏隐藏

imagepicker.showsCameraControls = YES;

//设置使用后置摄像头，可以使用前置摄像头

imagepicker.cameraDevice = UIImagePickerControllerCameraDeviceRear;

//设置闪光灯模式

/*

typedef NS_ENUM(NSInteger, UIImagePickerControllerCameraFlashMode) {

UIImagePickerControllerCameraFlashModeOff = -1,

UIImagePickerControllerCameraFlashModeAuto = 0,

UIImagePickerControllerCameraFlashModeOn = 1

};

*/

imagepicker.cameraFlashMode = UIImagePickerControllerCameraFlashModeAuto;

//设置相机支持的类型，拍照和录像

imagepicker.mediaTypes = @[(NSString*)kUTTypeImage,(NSString*)kUTTypeMovie];

//设置拍摄时屏幕的view的transform属性，可以实现旋转，缩放功能

// imagepicker.cameraViewTransform = CGAffineTransformMakeRotation(M_PI*45/180);

// imagepicker.cameraViewTransform = CGAffineTransformMakeScale(1.5, 1.5);

使用 imagepicker.cameraViewTransform = CGAffineTransformMakeRotation(M_PI*45/180);旋转45度的效果：

使用imagepicker.cameraViewTransform = CGAffineTransformMakeScale(1.5,
1.5);全屏的效果，同时imagepicker.showsCameraControls =NO;隐藏工具栏：

使用imagepicker.allowsEditing = YES;出现的图片编辑效果，只有当imagepicker.showsCameraControls
= YES;才有效果：

imagepicker.showsCameraControls = NO;

//拍照，会自动回调- (void)imagePickerController:(UIImagePickerController
*)picker didFinishPickingMediaWithInfo:(NSDictionary *)info，对于自定义照相机界面，拍照后回调可以不退出实现连续拍照效果

//获取拍照的照片

[imagepicker takePicture];

三
自定义相机拍照画面

//设置拍照时的下方的工具栏是否显示，如果需要自定义拍摄界面，则可把该工具栏隐藏

imagepicker.showsCameraControls = NO;

UIToolbar* tool = [[UIToolbar alloc]initWithFrame:CGRectMake(0, self.view.frame.size.height-55, self.view.frame.size.width, 75)];

tool.barStyle = UIBarStyleBlackTranslucent;

UIBarButtonItem* cancel = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(cancelCamera)];

UIBarButtonItem* add = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(savePhoto)];

[tool setItems:[NSArray arrayWithObjects:cancel,add, nil]];

//把自定义的view设置到imagepickercontroller的overlay属性中

imagepicker.cameraOverlayView = tool;

//

// ViewController.m

// ImagePIckerController

//

// Created by xalo on 15/10/20.

// Copyright (c) 2015年
蓝鸥科技. All rights reserved.

//

#import
"ViewController.h"

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

@property (weak,
nonatomic)
IBOutlet UIView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

- (IBAction)HandleBtnAction:(UIButton *)sender {

UIActionSheet *sheet ;

//判断是否支持相机

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{

{

sheet = [[UIActionSheet alloc] initWithTitle:@"选择"
delegate:self cancelButtonTitle:@"取消"
destructiveButtonTitle:@"取消"
otherButtonTitles:@"拍照",@"从相册选择",
nil];

}

}

else

{

sheet = [[UIActionSheet alloc] initWithTitle:@"选择"
delegate:self cancelButtonTitle:nil
destructiveButtonTitle:@"取消"
otherButtonTitles:@"从相册选择",@"相机胶卷模式",
nil];

}

[sheet showInView: self.view];

}

//判断是否支持相机,
跳转到相机或者相册界面

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

{

NSInteger sourceType = 0;

//判断是否支持相机

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{

switch (buttonIndex) {

case
0:

//取消

break;

case
1:

//相机

sourceType = UIImagePickerControllerSourceTypeCamera;

break;

case
2:

//从相册选择

sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

break;

default:

break;

}

}

else

{

//当不支持相机时,
仅支持相册

switch (buttonIndex) {

case
0:

//取消

break;

case
1:

//从相册选择

sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

break;

case
2:

//从相册胶卷模式

sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;

break;

default:

break;

}

}

//查看支持的媒体来源类型

NSLog(@"支持的媒体来源:%@",[UIImagePickerController
availableMediaTypesForSourceType:sourceType]);

//跳转到相机界面

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

//设置代理,
需要制定两个协议 UINavigationControllerDelegate && UIImagePickerControllerDelegate

imagePickerControlelr.delegate = self;

//设置是否允许编辑

imagePickerControlelr.allowsEditing = YES;

//设置打开的数据类型

imagePickerControlelr.sourceType = sourceType;

//设置媒体来源(相机模式下)

// imagePickerControlelr.mediaTypes = @[@"public.image",@"public.movie"];

imagePickerControlelr.mediaTypes = @[@"public.movie"];

// imagePickerControlelr.mediaTypes = @[@"public.image"];

//imagePickerControlelr.mediaTypes = @[];

//显示当前控制器

[self presentViewController:imagePickerControlelr animated:YES
completion:nil];

}

#pragma mark -

#pragma mark - UIImagePickerControllerDelegate -

//通过实现
imagePickerController 的代理协议
实现
图片的选取

//
完成选取图片时
执行的方法

- (void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info

{

//判断当获得的,
获取当前的媒体类型

NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];

NSLog(@"获取的媒体类型:%@",
mediaType);

//选取某个图片时,
退出当前视图控制器

[picker dismissViewControllerAnimated:YES completion:^{

NSLog(@"退出照片选取器");

}];

//获取编辑后的图片

UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];

NSLog(@"媒体的URL:
%@",[info objectForKey:UIImagePickerControllerReferenceURL]);

/*
此处info
有六个值

NSString *const UIImagePickerControllerMediaType ;指定用户选择的媒体类型（文章最后进行扩展）

NSString *const UIImagePickerControllerOriginalImage ;原始图片

NSString *const UIImagePickerControllerEditedImage ;修改后的图片

NSString *const UIImagePickerControllerCropRect ;裁剪尺寸

NSString *const UIImagePickerControllerMediaURL ;媒体的URL

NSString *const UIImagePickerControllerReferenceURL ;原件的URL

NSString *const UIImagePickerControllerMediaMetadata;当来数据来源是照相机的时候这个值才有效

*/

//将图片加载到视图上

[self additionImageViewWithImage:image];

}

//按下取消按钮式
执行的方法

- (void)imagePickerControllerDidCancel:(UIImagePickerController
*)picker

{

[picker dismissViewControllerAnimated:YES completion:^{

NSLog(@"关闭相册");

}];

}

#pragma mark - imageView -

- (void)additionImageViewWithImage:(UIImage
*)image

{

UIImageView *imageView = [[UIImageView alloc] initWithImage:image];

imageView.frame = self.imageView.bounds;

[self.imageView addSubview:imageView];

}

@end