我的应用程序从iPhone的库或相机中拍照。然后有一个开关控制将其转换为B&W照片。
当我控制开关时，它什么都不做。
我搞不清我的代码出了什么问题。我看了StackOverflow上的其他例子，但没能让我的例子发挥作用。有人看到明显的东西了吗？
这是我的头文件，下面是我的实现文件。
//
// ErdalKulguProjectViewController.h
// ErdalKulguProject
//
// Created by Kulgu, Erdal on 1/17/12.
// Copyright 2012 __MyCompanyName__. All rights reserved.
//
#import <UIKit/UIKit.h>
#import <MediaPlayer/MediaPlayer.h>
@interface ErdalKulguProjectViewController : UIViewController <MPMediaPickerControllerDelegate, UIImagePickerControllerDelegate,UINavigationControllerDelegate> {
IBOutlet UIImageView *chosenImage;
IBOutlet UISwitch *toggleCamera;
IBOutlet UISwitch *toggleBlackWhite;
}
-(IBAction)chooseImage:(id)sender;
- (UIImage *)convertImageToGrayScale:(UIImage *)image;
@property (nonatomic, retain) UIImageView *chosenImage;
@property (nonatomic,retain) UISwitch *toggleCamera;
@property (nonatomic,retain) UISwitch *toggleBlackWhite;
@end
实施文件：
//
// ErdalKulguProjectViewController.m
// ErdalKulguProject
//
// Created by Kulgu, Erdal on 1/17/12.
// Copyright 2012 __MyCompanyName__. All rights reserved.
//
#import "ErdalKulguProjectViewController.h"
@implementation ErdalKulguProjectViewController
@synthesize chosenImage;
@synthesize toggleCamera;
@synthesize toggleBlackWhite;
//@synthesize grayScale;
-(IBAction)chooseImage:(id)sender {
UIImagePickerController *imagePicker;
imagePicker = [[UIImagePickerController alloc] init];
if ([toggleCamera isOn]) {
imagePicker.sourceType=UIImagePickerControllerSourceTypeCamera;
} else {
imagePicker.sourceType=UIImagePickerControllerSourceTypePhotoLibrary;
}
imagePicker.delegate=self;
[[UIApplication sharedApplication] setStatusBarHidden:YES];
[self presentModalViewController:imagePicker animated:YES];
[imagePicker release];
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
[[UIApplication sharedApplication] setStatusBarHidden:NO];
[self dismissModalViewControllerAnimated:YES];
chosenImage.image=[info objectForKey: UIImagePickerControllerOriginalImage];
}
- (void)imagePickerControllerDidCancel: (UIImagePickerController *)picker {
[[UIApplication sharedApplication] setStatusBarHidden:NO];
[self dismissModalViewControllerAnimated:YES];
}
- (UIImage *)convertImageToGrayScale:(UIImage *)image
{
// Create image rectangle with current image width/height
CGRect imageRect = CGRectMake(0, 0, image.size.width, image.size.height);
if ([toggleBlackWhite isOn]) {
} else {
}
// Grayscale color space
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();
// Create bitmap content with current image size and grayscale colorspace
CGContextRef context = CGBitmapContextCreate(nil, image.size.width, image.size.height, 8, 0, colorSpace, kCGImageAlphaNone);
// Draw image into current context, with specified rectangle
// using previously defined context (with grayscale colorspace)
CGContextDrawImage(context, imageRect, [image CGImage]);
// Create bitmap image info from pixel data in current context
CGImageRef imageRef = CGBitmapContextCreateImage(context);
// Create a new UIImage object
UIImage *newImage = [UIImage imageWithCGImage:imageRef];
// Release colorspace, context and bitmap information
CGColorSpaceRelease(colorSpace);
CGContextRelease(context);
CFRelease(imageRef);
// Return the new grayscale image
return newImage;
}
/*
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
*/
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/
/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
}
*/
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[chosenImage release];
[toggleCamera release];
[toggleBlackWhite release];
[super dealloc];
}
@end
假设你的函数真的能工作，你需要在这里调用它：
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
[[UIApplication sharedApplication] setStatusBarHidden:NO];
[self dismissModalViewControllerAnimated:YES];
chosenImage.image=[info objectForKey: UIImagePickerControllerOriginalImage];
//adjust the image if switch is toggled
if ([toggleBlackWhite isOn]) chosenImage = [self convertImageToGrayScale:chosenImage];
}
然后显示所选的图像。