提到從攝像頭/相冊獲取圖片是面向終端用戶的，由用戶去瀏覽并選擇圖片為程序使用。在這里，我們需要過UIImagePickerController類來和用戶交互。

使用UIImagePickerController和用戶交互，我們需要實(shí)現(xiàn)2個(gè)協(xié)議<UIImagePickerControllerDelegate,UINavigationControllerDelegate>。

View Code

代碼如下復(fù)制代碼

#pragma mark 從用戶相冊獲取活動(dòng)圖片

- (void)pickImageFromAlbum

{

? ? imagePicker = [[UIImagePickerController alloc] init];

? ? imagePicker.delegate =self;

? ? imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

? ? imagePicker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

? ? imagePicker.allowsEditing =YES;

?? ?

? ? [self presentModalViewController:imagePicker animated:YES];

}

我們來看看上面的從相冊獲取圖片，我們首先要實(shí)例化UIImagePickerController對象，然后設(shè)置imagePicker對象為當(dāng)前對象，設(shè)置imagePicker的圖片來源為UIImagePickerControllerSourceTypePhotoLibrary，表明當(dāng)前圖片的來源為相冊，除此之外還可以設(shè)置用戶對圖片是否可編輯。

View Code

代碼如下復(fù)制代碼

#pragma mark 從攝像頭獲取活動(dòng)圖片

- (void)pickImageFromCamera

{

? ? imagePicker = [[UIImagePickerController alloc] init];

? ? imagePicker.delegate =self;

? ? imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

? ? imagePicker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

? ? imagePicker.allowsEditing =YES;

?? ?

? ? [self presentModalViewController:imagePicker animated:YES];

}

//打開相機(jī)

- (IBAction)touch_photo:(id)sender {

? ? // for iphone

? ? UIImagePickerController *pickerImage = [[UIImagePickerController alloc] init];

? ?if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

? ? ? ? pickerImage.sourceType = UIImagePickerControllerSourceTypeCamera;

? ? ? ? pickerImage.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:pickerImage.sourceType];

?? ? ? ?

? ? }

? ? pickerImage.delegate =self;

? ? pickerImage.allowsEditing =YES;//自定義照片樣式

? ? [self presentViewController:pickerImage animated:YES completion:nil];

}

以上是從攝像頭獲取圖片，和從相冊獲取圖片只是圖片來源的設(shè)置不一樣，攝像頭圖片的來源為UIImagePickerControllerSourceTypeCamera。

在和用戶交互之后，用戶選擇好圖片后，會回調(diào)選擇結(jié)束的方法。

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

{

? ? //初始化imageNew為從相機(jī)中獲得的--

? ? UIImage *imageNew = [info objectForKey:@"UIImagePickerControllerOriginalImage"];

? ? //設(shè)置image的尺寸

? ? CGSize imagesize = imageNew.size;

? ? imagesize.height =626;

? ? imagesize.width =413;

? ? //對圖片大小進(jìn)行壓縮--

? ? imageNew = [self imageWithImage:imageNew scaledToSize:imagesize];

? ? NSData *imageData = UIImageJPEGRepresentation(imageNew,0.00001);

? ?if(m_selectImage==nil)

? ? {

? ? ? ? m_selectImage = [UIImage imageWithData:imageData];

? ? ? ? NSLog(@"m_selectImage:%@",m_selectImage);

? ? ? ? [self.TakePhotoBtn setImage:m_selectImage forState:UIControlStateNormal];

? ? ? ? [picker dismissModalViewControllerAnimated:YES];

? ? ? ?return ;

? ? }

? ? [picker release];

}

//對圖片尺寸進(jìn)行壓縮--

-(UIImage*)imageWithImage:(UIImage*)image scaledToSize:(CGSize)newSize

{

? ? // Create a graphics image context

? ? UIGraphicsBeginImageContext(newSize);

?? ?

? ? // Tell the old image to draw in this new context, with the desired

? ? // new size

? ? [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];

?? ?

? ? // Get the new image from the context

? ? UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();

?? ?

? ? // End the context

? ? UIGraphicsEndImageContext();

?? ?

? ? // Return the new image.

? ?return newImage;

}

圖片保存到本地document里面--以及圖片格式的轉(zhuǎn)換

?

IOS開發(fā)之保存圖片到Documents目錄及PNG，JPEG格式相互轉(zhuǎn)換

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

????NSString?*mediaType?=?[info?objectForKey:UIImagePickerControllerMediaType];

????if?([mediaType?isEqualToString:@"public.image"]){

????????image?=?[info?objectForKey:@"UIImagePickerControllerOriginalImage"];

????????NSData?*data;

????????if?(UIImagePNGRepresentation(image)?==?nil)?{

????????????data?=?UIImageJPEGRepresentation(image,?1);

????????}?else?{

????????????data?=?UIImagePNGRepresentation(image);

????????}

????????

????????NSFileManager?*fileManager?=?[NSFileManager?defaultManager];

????????NSString?*filePath?=?[NSString?stringWithString:[self?getPath:@"image1"]];?????????//將圖片存儲到本地documents

?????????[fileManager?createDirectoryAtPath:filePath?withIntermediateDirectories:YES?attributes:nil?error:nil];

?????????[fileManager?createFileAtPath:[filePath?stringByAppendingString:@"/image.png"]?contents:dataattributes:nil];

????????

????????UIImage?*editedImage?=?[[UIImage?alloc]?init];

????????editedImage?=?image;

????????CGRect?rect?=?CGRectMake(0,?0,?64,?96);

????????UIGraphicsBeginImageContext(rect.size);

????????[editedImage?drawInRect:rect];

????????editedImage?=?UIGraphicsGetImageFromCurrentImageContext();

????????

????????UIButton?*imageButton?=?[UIButton?buttonWithType:UIButtonTypeCustom];

????????imageButton.frame?=?CGRectMake(10,?10,?64,?96);

????????[imageButton?setImage:editedImage?forState:UIControlStateNormal];

????????[self.view?addSubview:imageButton];

????????[imageButton?addTarget:self?action:@selector(imageAction:)forControlEvents:UIControlEventTouchUpInside];

????????[ipc?dismissModalViewControllerAnimated:YES];

????}?else?{

????????NSLog(@"MEdia");

????}

????

上面的代碼是當(dāng)從相冊里面選取圖片之后保存到本地程序沙盒，在上面我們得到的圖片中不能夠得到圖片名字，以及不清楚圖片格式，所以這個(gè)時(shí)候我們需要將其轉(zhuǎn)換成NSdata二進(jìn)制存儲，

?image?=?[info?objectForKey:@"UIImagePickerControllerOriginalImage"];

NSData?*data;

????????if?(UIImagePNGRepresentation(image)?==?nil)?{

????????????data?=?UIImageJPEGRepresentation(image,?1);

????????}?else?{

????????????data?=?UIImagePNGRepresentation(image);

????????}

UIImagePNGRepresentation轉(zhuǎn)換PNG格式的圖片為二進(jìn)制，如果圖片的格式為JPEG則返回nil；

?[fileManager?createFileAtPath:[filePath?stringByAppendingString:@"/image.png"]?contents:data?attributes:nil];????將圖片保存為PNG格式

?[fileManager?createFileAtPath:[filePath?stringByAppendingString:@"/image.jpg"]?contents:data?attributes:nil];???將圖片保存為JPEG格式

我們也可以寫成下面的格式存儲圖片

NSString?*pngImage?=?[filePath?stringByAppendingPathComponent:@"Documents/image.png"];

NSString?*jpgImage?=?[filePath?stringByAppendingPathComponent:@"Documents/image.jpg"];

[data?writeToFile:pngImage?atomically:YES];

[data?writeToFile:jpgImage?atomically:YES];

?

?

?

轉(zhuǎn)載于:https://www.cnblogs.com/jiangu66/p/3246612.html

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