XCode的圖片操作 (1)

取得圖片的方式，主要是透過UIImagePickerController進行控制，然後使用UIImageView顯示。我們先在interface中加入必要的Delegate並建立這兩個property:

#import <UIKit/UIKit.h>

@interface MainView : UIViewController <UINavigationControllerDelegate,UIImagePickerControllerDelegate>

@property (nonatomic, strong) UIImagePickerController *imagePicker;

@property (nonatomic, strong) IBOutlet UIImageView *imageField;

@end

然後我們同步剛才建立的兩個property:

@synthesize imagePicker,imageField;

接下來建立兩個method,一個是由library中取得圖片，而另一個就是由camera取得圖片：

- (IBAction)imageFromAlbum:(id)sender

{

    imagePicker = [[UIImagePickerController alloc] init];

    imagePicker.delegate = self;

    imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;

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

}

- (IBAction)imageFromCamera:(id)sender

{

    imagePicker = [[UIImagePickerController alloc] init];

    imagePicker.delegate = self;

    imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

    imagePicker.cameraDevice = UIImagePickerControllerCameraDeviceRear;

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

}

當我們透過以上方式取得圖片後，系統會自動使用didFinishPickingImage來取得圖片，並進行設定或儲存：

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

{

    [imagePicker dismissModalViewControllerAnimated:YES];

    [imageField setImage:image];

}

我們需要的property及method都建立好了，現在我們只要在storyboard中加入兩個Round Rect Button,一個連到imageFromAlbum另一個連到imageFromCamera,然後再加一個ImageView並連結到imageField即可。