IOS实用功能之截图（来自相册和拍照）

//

//  ViewController.m

//  MyImagePicker1.0

//

//  Created by Mac on 14-7-14.

//  Copyright (c) 2014年 Digital media technology. All rights reserved.

//

#import "ViewController.h"

#import "VPImageCropperViewController.h"

#import <AssetsLibrary/AssetsLibrary.h>

#import <MobileCoreServices/MobileCoreServices.h>

#define ORIGINAL_MAX_WIDTH 640.0f

@interfaceViewController () <UINavigationControllerDelegate,UIImagePickerControllerDelegate,
UIActionSheetDelegate,VPImageCropperDelegate>

@property (weak, nonatomic)IBOutletUIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad

{

[superviewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

//do some init job for UIImageView

[self.imageView.layersetCornerRadius:(self.imageView.frame.size.height/2)];

[self.imageView.layersetMasksToBounds:YES];

[self.imageViewsetContentMode:UIViewContentModeScaleAspectFill];

[self.imageViewsetClipsToBounds:YES];

UITapGestureRecognizer *tapGR = [[UITapGestureRecognizeralloc]
initWithTarget:selfaction:@selector(tapGRAction)];

self.imageView.layer.borderWidth = 1.0;

self.imageView.layer.borderColor = [[UIColorblackColor]
CGColor];

[self.imageViewaddGestureRecognizer:tapGR];

//load an image

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^ {

NSURL *portraitUrl = [NSURLURLWithString:@"http://photo.l99.com/bigger/31/1363231021567_5zu910.jpg"];

UIImage *protraitImg = [UIImageimageWithData:[NSDatadataWithContentsOfURL:portraitUrl]];

dispatch_sync(dispatch_get_main_queue(), ^{

self.imageView.image = protraitImg;

});

});

}

-(void)tapGRAction{

NSLog(@"tap");

UIActionSheet *actionSheet = [[UIActionSheetalloc]
initWithTitle:@"选择"delegate:selfcancelButtonTitle:@"Cancel"destructiveButtonTitle:nilotherButtonTitles:@"Take
photo",@"From Albums",
nil];

[actionSheet showInView:self.view];

}

-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{

switch (buttonIndex) {

case 0:

NSLog(@"Take photo");

// 拍照

if ([selfisCameraAvailable] && [selfdoesCameraSupportTakingPhotos])
{

UIImagePickerController *controller = [[UIImagePickerControlleralloc]
init];

controller.sourceType =UIImagePickerControllerSourceTypeCamera;

if ([selfisFrontCameraAvailable]) {

controller.cameraDevice =UIImagePickerControllerCameraDeviceFront;

}

NSMutableArray *mediaTypes = [[NSMutableArrayalloc]
init];

[mediaTypes addObject:(__bridgeNSString *)kUTTypeImage];

controller.mediaTypes = mediaTypes;

controller.delegate =
self;

[self presentViewController:controller

animated:YES

completion:^(void){

NSLog(@"Picker View Controller is presented");

}];

}

break;

case 1:

NSLog(@"Albums");

// 从相册中选取

if ([selfisPhotoLibraryAvailable]) {

UIImagePickerController *controller = [[UIImagePickerControlleralloc]
init];

controller.sourceType =UIImagePickerControllerSourceTypePhotoLibrary;

NSMutableArray *mediaTypes = [[NSMutableArrayalloc]
init];

[mediaTypes addObject:(__bridgeNSString *)kUTTypeImage];

controller.mediaTypes = mediaTypes;

controller.delegate =
self;

[self presentViewController:controller

animated:YES

completion:^(void){

NSLog(@"Picker View Controller is presented");

}];

}

break;

default:

break;

}

}

#pragma mark VPImageCropperDelegate

- (void)imageCropper:(VPImageCropperViewController *)cropperViewController didFinished:(UIImage *)editedImage {

self.imageView.image = editedImage;

//    [self.imageView.layer setCornerRadius:(self.imageView.frame.size.height/2)];

//    [self.imageView.layer setMasksToBounds:YES];

//    [self.imageView setContentMode:UIViewContentModeScaleAspectFill];

//    [self.imageView setClipsToBounds:YES];

[cropperViewController dismissViewControllerAnimated:YEScompletion:^{

// TO DO

}];

}

- (void)imageCropperDidCancel:(VPImageCropperViewController *)cropperViewController {

[cropperViewController dismissViewControllerAnimated:YEScompletion:^{

}];

}

#pragma mark - UIImagePickerControllerDelegate

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

[picker dismissViewControllerAnimated:YEScompletion:^() {

UIImage *portraitImg = [infoobjectForKey:@"UIImagePickerControllerOriginalImage"];

portraitImg = [self
imageByScalingToMaxSize:portraitImg];

// 裁剪

VPImageCropperViewController *imgEditorVC = [[VPImageCropperViewControlleralloc]
initWithImage:portraitImg cropFrame:CGRectMake(0, 100.0f,
self.view.frame.size.width,self.view.frame.size.width)limitScaleRatio:3.0];

imgEditorVC.delegate =
self;

[selfpresentViewController:imgEditorVC
animated:YEScompletion:^{

// TO DO

}];

}];

}

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

[picker dismissViewControllerAnimated:YEScompletion:^(){

}];

}

#pragma mark - UINavigationControllerDelegate

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{

}

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{

}

#pragma mark camera utility

- (BOOL) isCameraAvailable{

return [UIImagePickerControllerisSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];

}

- (BOOL) isRearCameraAvailable{

return [UIImagePickerControllerisCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];

}

- (BOOL) isFrontCameraAvailable {

return [UIImagePickerControllerisCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront];

}

- (BOOL) doesCameraSupportTakingPhotos {

return [selfcameraSupportsMedia:(__bridgeNSString
*)kUTTypeImagesourceType:UIImagePickerControllerSourceTypeCamera];

}

- (BOOL) isPhotoLibraryAvailable{

return [UIImagePickerControllerisSourceTypeAvailable:

UIImagePickerControllerSourceTypePhotoLibrary];

}

- (BOOL) canUserPickVideosFromPhotoLibrary{

return [self

cameraSupportsMedia:(__bridgeNSString *)kUTTypeMoviesourceType:UIImagePickerControllerSourceTypePhotoLibrary];

}

- (BOOL) canUserPickPhotosFromPhotoLibrary{

return [self

cameraSupportsMedia:(__bridgeNSString *)kUTTypeImagesourceType:UIImagePickerControllerSourceTypePhotoLibrary];

}

- (BOOL) cameraSupportsMedia:(NSString *)paramMediaType sourceType:(UIImagePickerControllerSourceType)paramSourceType{

__block BOOL result =NO;

if ([paramMediaType length] == 0) {

return NO;

}

NSArray *availableMediaTypes = [UIImagePickerControlleravailableMediaTypesForSourceType:paramSourceType];

[availableMediaTypes enumerateObjectsUsingBlock: ^(id obj,NSUInteger idx,
BOOL *stop) {

NSString *mediaType = (NSString *)obj;

if ([mediaType isEqualToString:paramMediaType]){

result = YES;

*stop= YES;

}

}];

return result;

}

#pragma mark image scale utility

- (UIImage *)imageByScalingToMaxSize:(UIImage *)sourceImage {

if (sourceImage.size.width <ORIGINAL_MAX_WIDTH)
return sourceImage;

CGFloat btWidth = 0.0f;

CGFloat btHeight = 0.0f;

if (sourceImage.size.width > sourceImage.size.height) {

btHeight = ORIGINAL_MAX_WIDTH;

btWidth = sourceImage.size.width * (ORIGINAL_MAX_WIDTH / sourceImage.size.height);

} else {

btWidth = ORIGINAL_MAX_WIDTH;

btHeight = sourceImage.size.height * (ORIGINAL_MAX_WIDTH / sourceImage.size.width);

}

CGSize targetSize = CGSizeMake(btWidth, btHeight);

return [selfimageByScalingAndCroppingForSourceImage:sourceImage
targetSize:targetSize];

}

- (UIImage *)imageByScalingAndCroppingForSourceImage:(UIImage *)sourceImage targetSize:(CGSize)targetSize {

UIImage *newImage = nil;

CGSize imageSize = sourceImage.size;

CGFloat width = imageSize.width;

CGFloat height = imageSize.height;

CGFloat targetWidth = targetSize.width;

CGFloat targetHeight = targetSize.height;

CGFloat scaleFactor = 0.0;

CGFloat scaledWidth = targetWidth;

CGFloat scaledHeight = targetHeight;

CGPoint thumbnailPoint =
CGPointMake(0.0,0.0);

if (CGSizeEqualToSize(imageSize, targetSize) ==NO)

{

CGFloat widthFactor = targetWidth / width;

CGFloat heightFactor = targetHeight / height;

if (widthFactor > heightFactor)

scaleFactor = widthFactor; // scale to fit height

else

scaleFactor = heightFactor; // scale to fit width

scaledWidth  = width * scaleFactor;

scaledHeight = height * scaleFactor;

// center the image

if (widthFactor > heightFactor)

{

thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;

}

else

if (widthFactor < heightFactor)

{

thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;

}

}

UIGraphicsBeginImageContext(targetSize);// this will crop

CGRect thumbnailRect =
CGRectZero;

thumbnailRect.origin = thumbnailPoint;

thumbnailRect.size.width  = scaledWidth;

thumbnailRect.size.height = scaledHeight;

[sourceImage drawInRect:thumbnailRect];

newImage = UIGraphicsGetImageFromCurrentImageContext();

if(newImage ==nil)
NSLog(@"could not scale image");

//pop the context to get back to the default

UIGraphicsEndImageContext();

return newImage;

}

#pragma mark portraitImageView getter

- (UIImageView *)portraitImageView {

if (!self.imageView) {

CGFloat w = 100.0f;
CGFloat h = w;

CGFloat x = (self.view.frame.size.width - w) / 2;

CGFloat y = (self.view.frame.size.height - h) / 2;

self.imageView = [[UIImageViewalloc]
initWithFrame:CGRectMake(x, y, w, h)];

//把图像变成圆形的代码

[self.imageView.layersetCornerRadius:(self.imageView.frame.size.height/2)];

[self.imageView.layersetMasksToBounds:YES];

[self.imageViewsetContentMode:UIViewContentModeScaleAspectFill];

[self.imageViewsetClipsToBounds:YES];

//设置阴影

self.imageView.layer.shadowColor = [UIColorblackColor].CGColor;

self.imageView.layer.shadowOffset =CGSizeMake(4, 4);

self.imageView.layer.shadowOpacity = 0.5;

self.imageView.layer.shadowRadius = 2.0;

//设置边框的大小和颜色

self.imageView.layer.borderColor = [[UIColorblackColor]
CGColor];

self.imageView.layer.borderWidth = 2.0f;

self.imageView.userInteractionEnabled =YES;

self.imageView.backgroundColor = [UIColorblackColor];

UITapGestureRecognizer *portraitTap = [[UITapGestureRecognizeralloc]
initWithTarget:selfaction:@selector(editPortrait)];

[self.imageViewaddGestureRecognizer:portraitTap];

}

returnself.imageView;

}

- (void)didReceiveMemoryWarning

{

[superdidReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end