1. 在xcode中新建一個基于view的工程，命名為PicViewer

2.修改PicViewerViewController.h：

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#import <UIKit/UIKit.h>

@interface PicViewerViewController : UIViewController<UIGestureRecognizerDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate> {

? ? IBOutletUIImageView *imageView;

}

@property (nonatomic, retain) IBOutlet UIImageView *imageView;

@end

3.在PicViewerController.m中添加如下一行：

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@synthesize imageView;

4.打開PicViewerViewController.xib，拖一個UIImageView到View窗口中，并建立與imageView的連接

5.在PicViewerViewController.m中添加如下內容

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#pragma mark -

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

? ? imageView.image = [info objectForKey:UIImagePickerControllerOriginalImage];

? ??[picker dismissModalViewControllerAnimated:YES];

}

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

? ??[picker dismissModalViewControllerAnimated:YES];

}

6.在PicViewerViewController.m添加如下內容

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#pragma mark -

#pragma mark Gesture Handler

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- (void)resetImageView:(UITapGestureRecognizer *)recognizer {

? ??[UIImageViewbeginAnimations:nilcontext:NULL];

? ??[UIImageViewsetAnimationDuration:1];

? ??[UIImageViewsetAnimationBeginsFromCurrentState:YES];

? ??imageView.transform = CGAffineTransformIdentity;

? ? [UIImageViewcommitAnimations];

}

- (void)handlePinchFrom:(UIPinchGestureRecognizer *)recognizer {

float scaleFactor = [recognizer scale];

imageView.transform = CGAffineTransformMakeScale(scaleFactor, scaleFactor);

}

- (void)handlePanFrom:(UIPanGestureRecognizer *)recognizer {

? ? CGPoint trans = [recognizer translationInView:imageView];

? ? imageView.transform = CGAffineTransformMakeTranslation(trans.x, trans.y);

}

- (void)selectPicture:(UILongPressGestureRecognizer *)recognizer{

? ? if ([UIImagePickerControllerisSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {

? ? ? ??UIImagePickerController *picker = [[UIImagePickerControlleralloc]init];

? ? ? ??picker.delegate = self;

? ? ? ??picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

? ? ? ??[selfpresentModalViewController:picker animated:YES];

? ? ? ?[picker release];

? ??}

? ??else {

? ? ? ??UIAlertView *alert = [[UIAlertViewalloc]

? ? ??? ? ?initWithTitle:@"Error accessing photo library"

? ? ? ? ? ?message:@"Device does not support a photo library"

? ? ? ? ?? delegate:nil

? ? ? ? ? ?cancelButtonTitle:@"Cancel"?

? ? ? ? ???otherButtonTitles:nil];

? ? ? ??[alert show];

? ? ? ??[alert release];

? ??}

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}

7.修改viewDidLoad與dealloc如下

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- (void)viewDidLoad {

? ??[superviewDidLoad];

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? ??UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizeralloc] initWithTarget:selfaction:@selector(resetImageView:)];

? ??tapRecognizer.numberOfTapsRequired = 2;

? ??[self.imageView addGestureRecognizer:tapRecognizer];

? ? tapRecognizer.delegate = self;

? ??[tapRecognizer release];

?

? ??UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizeralloc]?initWithTarget:self

action:@selector(handlePinchFrom:)];

? ??[self.imageView addGestureRecognizer:pinchRecognizer];

? ??pinchRecognizer.delegate = self;

? ??[pinchRecognizer release];

?

? ??UILongPressGestureRecognizer *longPressRecognizer = [[UILongPressGestureRecognizeralloc] initWithTarget:self ?action:@selector(selectPicture:)];

? ??[self.imageView addGestureRecognizer:longPressRecognizer];

? ??longPressRecognizer.delegate = self;

? ??[longPressRecognizer release];

?

? ??UIPanGestureRecognizer *panGestureReconizer = [[UIPanGestureRecognizeralloc] initWithTarget:selfaction:@selector(handlePanFrom:)];

[self.imageView addGestureRecognizer:panGestureReconizer];

panGestureReconizer.delegate = self;

[panGestureReconizer release];

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[selfperformSelector:@selector(selectPicture:) withObject:nilafterDelay:0.5f];

}

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- (void)dealloc {

[imageViewrelease];

? ? [super dealloc];

}

轉載于:https://www.cnblogs.com/chivas/archive/2012/05/21/2512323.html

超強干貨來襲 云風專訪：近40年碼齡，通宵達旦的技術人生

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