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UIPopverController,UIImagePickerController,图片选取。
/*使用UIImagePickerController和UIPopverController， 先在头文件中设置要遵循的协议：<UINavigationControllerDelegate,UIImagePickerControllerDelegate,UIPopoverControllerDelegate>*/
@implementation PickerVC
{
/*UIPopoverController must use the global variable*/
UIPopoverController *_popController;
UIBarButtonItem *_popbbi;
UIImageView *_imageView;
}
#pragma mark - UIImagePickerControllerDelegate
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
/*
1.implicit conversion of Objective-C pointer type ‘NSDictionary *‘to C pointer type ‘CFTypeRef‘(asa‘const void‘*)required a bridged cast
2.Use __bridge to convert directly(no change in ownership)
3.void CFShow (CFTypeRef obj);Prints a description of a Core Foundation object to stderr.
*/
CFShow((__bridge CFTypeRef)(info));
_imageView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 300, 300, 300)];
_imageView.image = [info objectForKey:@"UIImagePickerControllerEditedImage"];
[self.view addSubview:_imageView];
//如果是在iPad中使用的UIPopverController，则下面这个方法没有被调用。
[self dismissViewControllerAnimated:YES completion:^{
printf("UIImagePickerControllerEditedImage:edited chose!\n");
}];
}
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
[picker dismissViewControllerAnimated:YES completion:^{
printf("dismissViewController!\n");
}];
}
-(void)pickImage:(id)sender{
UIImagePickerController *ipc = [[UIImagePickerController alloc] init];
ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
ipc.delegate = self;
ipc.allowsEditing = YES;//这个设置是选取图片的关键。
//进行硬件环境判断，如果是iPad，可以使用UIPopoverController,但是如果是在iPhone环境中则不能使用UIPopverController，否则会Crash。
if (UI_USER_INTERFACE_IDIOM()==UIUserInterfaceIdiomPad) {
_popController = [[UIPopoverController alloc] initWithContentViewController:ipc];
_popController.delegate = self;
[_popController presentPopoverFromBarButtonItem:self.navigationItem.rightBarButtonItem permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
return;
}
//iPhone中一般使用下面这个方法就可以了。iPad也可以使用
[self presentViewController:ipc animated:YES completion:^{
}];
}
-(void)popbbiClick:(UIBarButtonItem *)popbbi{
printf("click popbbi\n");
PickImageViewController *pvc = [[PickImageViewController alloc] init];
[self.navigationController pushViewController:pvc animated:YES];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
self.navigationItem.rightBarButtonItem = kBarButton(@"Pick", @selector(pickImage:));
self.title = @"Image Picker";
_popbbi = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks target:self action:@selector(popbbiClick:)];
self.navigationItem.leftBarButtonItem = _popbbi;
}
=======================下面再使用一次
@implementation PickImageViewController
{
UIImagePickerController *_pvc;
UIPopoverController *_popController;
UIImageView *_imageView;
UIImage *_image;
}
-(void)initUIItems{
_pvc = [[UIImagePickerController alloc] init];
_pvc.delegate = self;
_pvc.allowsEditing = YES;//要使用选中的Medio内容需要设置这个为YES。
_pvc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
_imageView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 100, 300, 300)];
_imageView.backgroundColor = [UIColor yellowColor];
_imageView.userInteractionEnabled = YES;
[self.view addSubview:_imageView];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapTouched:)];
tap.numberOfTapsRequired = 2;
[_imageView addGestureRecognizer:tap];
}
-(void)tapTouched:(UIGestureRecognizer *)tap{
if (UI_USER_INTERFACE_IDIOM()==UIUserInterfaceIdiomPad) {
UIPopoverController *popvc = [[UIPopoverController alloc] initWithContentViewController:_pvc];
popvc.delegate = self;
/*这里需要注意，对局部UIPopoverController对象popover我们赋给了一个全局的UIPopoverController对象popoverController。而不能直接调用popover。因为在popover对象还可见时，是不能够被释放的。
Popover controllers are for use exclusively on iPad devices. Attempting to create one on other devices results in an exception. */
_popController = popvc;
[_popController presentPopoverFromRect:CGRectMake(100, 100, 400,400) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
return;
}
/*在iPhonez中可以直接使用下面的方法，但是在iPad中需要使用到上面的UIPopoverController，但是记住还是需要ImagePicker的代理方法，否则选不到图片，其实不同点就在上面这一点上。*/
[self presentViewController:_pvc animated:YES completion:^{
printf("PresentViewController: open ImagePicker menu!\n");
}];
}
/*下面的代理方法依然不变！*/
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
_image = (UIImage *)[info objectForKey:@"UIImagePickerControllerOriginalImage"];
_imageView.image = _image;
[self dismissViewControllerAnimated:YES completion:^{
printf("Picker choose the oneImage and dismissViewController\n");
}];
}
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
[self dismissViewControllerAnimated:YES completion:^{
printf("ImagePicker menu DismissViewController\n");
}];
}
=======
对于iPad来说，可以选择UIPopverController来使用UIImagePickerController，
因为iPad的大屏关系，这样使用其实有更好的用户体验，另外注意代理设置，可编辑属性设置，
_pvc.allowsEditing = YES;//要使用选中的Image需要设置这个为YES。
ipc.allowsEditing = YES;//这个设置是选取图片的关键。
注意UIPopverController只能再iPad环境下使用。
if (UI_USER_INTERFACE_IDIOM()==UIUserInterfaceIdiomPad) {}else Crash~