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
