<pre name="code" class="java">//IOS主要用的是UIImagePickerControllerDelegate这个事件委托来实现照相以及进入照片库的

@protocol UIImagePickerControllerDelegate<NSObject>

@optional

// The picker does not dismiss itself; the client dismisses it in these callbacks.

// The delegate will receive one or the other, but not both, depending whether the user

// confirms or cancels.

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_NA,__MAC_NA,__IPHONE_2_0,__IPHONE_3_0);

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

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

@end

应用ActionSheet弹出框  弹出三个按钮，共用户选择

：第一步：

//取得设备型号

#import <sys/types.h>

#import <sys/sysctl.h>  

- (NSString *) platform{

    size_t size;

    sysctlbyname("hw.machine", NULL, &size, NULL, );

    char *machine = malloc(size);

    sysctlbyname("hw.machine", machine, &size, NULL, );

    NSString *platform = [NSString stringWithUTF8String:machine];

    free(machine);

    return platform;

}  

- (NSString *) platformString{

    NSString *platform = [self platform];

    if ([platform isEqualToString:@"iPhone1,1"])    return @"iPhone 1G";

    if ([platform isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";

    if ([platform isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";

    if ([platform isEqualToString:@"iPhone3,1"])    return @"iPhone 4";

    if ([platform isEqualToString:@"iPhone3,2"])    return @"Verizon iPhone 4";

    if ([platform isEqualToString:@"iPod1,1"])      return @"iPod Touch 1G";

    if ([platform isEqualToString:@"iPod2,1"])      return @"iPod Touch 2G";

    if ([platform isEqualToString:@"iPod3,1"])      return @"iPod Touch 3G";

    if ([platform isEqualToString:@"iPod4,1"])      return @"iPod Touch 4G";

    if ([platform isEqualToString:@"iPad1,1"])      return @"iPad";

    if ([platform isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";

    if ([platform isEqualToString:@"iPad2,2"])      return @"iPad 2 (GSM)";

    if ([platform isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";

    if ([platform isEqualToString:@"i386"])         return @"Simulator";

    return platform;

}  

：第二步：

实现UIActionSheetDelegate委托方法

@protocol UIActionSheetDelegate <NSObject>

@optional

// Called when a button is clicked. The view will be automatically dismissed after this call returns

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

// Called when we cancel a view (eg. the user clicks the Home button). This is not called when the user clicks the cancel button.

// If not defined in the delegate, we simulate a click in the cancel button

- (void)actionSheetCancel:(UIActionSheet *)actionSheet;

- (void)willPresentActionSheet:(UIActionSheet *)actionSheet;  // before animation and showing view

- (void)didPresentActionSheet:(UIActionSheet *)actionSheet;  // after animation

- (void)actionSheet:(UIActionSheet *)actionSheet willDismissWithButtonIndex:(NSInteger)buttonIndex; // before animation and hiding view

- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex;  // after animation

@end  

//选择ActionSheet的初始化，并弹出ActionSheet

-(IBAction) chooseHeadPhoto{

    UIActionSheet *actionSheet=[[UIActionSheet alloc] init];

    if (deviceType == @"Simulator" || deviceType == @"iPad"||deviceType == @"iPod Touch 1G"

        ||deviceType == @"iPod Touch 2G"||deviceType== @"iPod Touch 3G")

    {

        if (contactsAdd.Photo != nil)

            actionSheet=[[UIActionSheet alloc]

                         initWithTitle:nil

                         delegate:self

                         cancelButtonTitle:@"Cancel"

                         destructiveButtonTitle:@"Delete this Photo"

                         otherButtonTitles:@"Choose Photo",nil];

        else {

            actionSheet=[[UIActionSheet alloc]

                         initWithTitle:nil

                         delegate:self

                         cancelButtonTitle:@"Cancel"

                         destructiveButtonTitle:nil

                         otherButtonTitles:@"Choose Photo",nil];

        }

    }

    else {

        if (contactsAdd.Photo != nil)

            actionSheet=[[UIActionSheet alloc]

                         initWithTitle:nil

                         delegate:self

                         cancelButtonTitle:@"Cancel"

                         destructiveButtonTitle:@"Delete this Photo"

                         otherButtonTitles:@"Choose Photo",@"Take Photo",nil];

        else {

            actionSheet=[[UIActionSheet alloc]

                         initWithTitle:nil

                         delegate:self

                         cancelButtonTitle:@"Cancel"

                         destructiveButtonTitle:nil

                         otherButtonTitles:@"Choose Photo",@"Take Photo",nil];

        }

    }

    [actionSheet showInView:self.view];

    [actionSheet release];

}  

//实现委托方法中的clickedButtonAtIndex

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

    if(!(deviceType == @"Simulator" || deviceType == @"iPad"||deviceType == @"iPod Touch 1G"||deviceType == @"iPod Touch 2G"||deviceType== @"iPod Touch 3G"))

    {

        //有头像

        if (contactsAdd.Photo != nil)

        {

            //返回

            if(buttonIndex == )

            {

                return;

            }

            //删除

            if(buttonIndex==)

            {

                NSString *imagePath = [NSString stringWithFormat:@"%@/%@.jpg", self.documentsPath, contactsAdd.Photo];

                NSError *error = nil;

                if([fileManager fileExistsAtPath:imagePath])

                {

                    [fileManager removeItemAtPath:imagePath error:&error];

                }

                contactsAdd.Photo = nil;

                //          headImageView.image = nil;

                //              headImageView.image=[UIImage imageNamed:@"nophoto65px.png"];

            }

            //选择

            if(buttonIndex == )

            {

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

                if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)

                {

                    [picker.navigationBar setTintColor:[UIColor colorWithRed:222.0/255.0 green:109.0/255.0 blue:144.0/255.0 alpha:1.0]];

                    //给navigationBar设置背景图片

                    if ([picker.navigationBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)]) {

                        [picker.navigationBar setBackgroundImage:[UIImage imageNamed:@"64px.png"] forBarMetrics:UIBarMetricsDefault];

                    }

                    [picker.navigationBar setFrame:CGRectMake(, , , )];

                    picker.navigationBar.layer.contents = (id)[UIImage imageNamed:@"64px.png"].CGImage;

                }

                else {

                    [picker.navigationBar setTintColor:[UIColor colorWithRed:208.0/255.0 green:75.0/255.0 blue:109.0/255.0 alpha:1.0]];

                    //给navigationBar设置背景图片

                    if ([picker.navigationBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)]) {

                        [picker.navigationBar setBackgroundImage:[UIImage imageNamed:@"a_nav_bg.png"] forBarMetrics:UIBarMetricsDefault];

                    }

                }  

                picker.delegate = self;

                if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {

                    [picker setModalPresentationStyle:UIModalPresentationFormSheet];

                }

                [self presentModalViewController:picker animated:YES];

                if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)

                {

                    [picker.view.superview setFrame:CGRectMake(, , picker.view.frame.size.width, )];

                }

                [picker release];

            }

            //取像

            if(buttonIndex == )

            {

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

                if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)

                {

                    [picker.navigationBar setTintColor:[UIColor colorWithRed:222.0/255.0 green:109.0/255.0 blue:144.0/255.0 alpha:1.0]];

                    //给navigationBar设置背景图片

                    if ([picker.navigationBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)]) {

                        [picker.navigationBar setBackgroundImage:[UIImage imageNamed:@"64px.png"] forBarMetrics:UIBarMetricsDefault];

                    }

                    [picker.navigationBar setFrame:CGRectMake(, , , )];

                    picker.navigationBar.layer.contents = (id)[UIImage imageNamed:@"64px.png"].CGImage;

                }

                else {

                    [picker.navigationBar setTintColor:[UIColor colorWithRed:208.0/255.0 green:75.0/255.0 blue:109.0/255.0 alpha:1.0]];

                    //给navigationBar设置背景图片

                    if ([picker.navigationBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)]) {

                        [picker.navigationBar setBackgroundImage:[UIImage imageNamed:@"a_nav_bg.png"] forBarMetrics:UIBarMetricsDefault];

                    }

                }

                picker.sourceType = UIImagePickerControllerSourceTypeCamera;

                picker.delegate=self;

                if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {

                    [picker setModalPresentationStyle:UIModalPresentationFormSheet];

                }

                [self presentModalViewController:picker animated:YES];

                if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)

                {

                    [picker.view.superview setFrame:CGRectMake(, , picker.view.frame.size.width, )];

                }

                [picker release];

            }

        }

    }

}

：第三步：

实现UIImagePickerControllerDelegate的委托方法

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_NA,__MAC_NA,__IPHONE_2_0,__IPHONE_3_0);

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

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

NSString *imagePath = [NSString stringWithFormat:@"%@/%@.jpg", self.documentsPath, contactsAdd.Photo];

NSError *error = nil;

if([fileManager fileExistsAtPath:imagePath])

{

[fileManager removeItemAtPath:imagePath error:&error];

}

contactsAdd.Photo = nil;

CFUUIDRef theUUID = CFUUIDCreate(NULL);

CFStringRef string = CFUUIDCreateString(NULL, theUUID);

CFRelease(theUUID);

imageName = (NSString *)string;

//将图层的边框设置为圆脚

headImageView.layer.cornerRadius = ;

headImageView.layer.masksToBounds = YES;

headImageView.image = [ImageUtility imageByScalingAndCroppingForSize:selectedImage withTargetSize:CGSizeMake(,)];

headNewImageData= [NSData dataWithData:UIImageJPEGRepresentation(headImageView.image, .f)];

[headNewImageData retain];

[self dismissModalViewControllerAnimated:YES];

}  

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

    [self dismissModalViewControllerAnimated:YES];

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

当用户选取完成后调用；

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

当用户取消选取时调用；

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

选取的信息都在info中，info 是一个字典。

字典中的键：

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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

UIImagePickerController 的更多参数参考这里。

代理中的功能参考这里。

UIImagePickerControllerMediaType 包含着KUTTypeImage 和KUTTypeMovie

KUTTypeImage 包含：

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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：

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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;

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