iOS图片处理（一）调用系统相机和相册获取图片，给相机添加自定义覆盖物

[摘要：起首，拍照或从相册挑选照片须要应用 UIImagePickerController，应用时须要增加两个协定 #import UIKit/UIKit.h @interface ViewController : UIViewControllerUINavigationControllerDelegate,UIImagePickerControllerDelegate]首先，照相或从相册选择照片需要使用UIImagePickerController，使用时需要添加两个协议

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<UINavigationControllerDelegate,UIImagePickerControllerDelegate>

@property (weak, nonatomic) IBOutlet UIScrollView *imageScroll;

@property (weak, nonatomic) IBOutlet UIImageView *photoImage;

@end

从相机获取图片的方式：

//从相机获取图片

- (IBAction)photoFromCamera:(id)sender {

if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){

UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;//设置类型为相机

UIImagePickerController *picker = [[UIImagePickerController alloc] init];//初始化

picker.delegate = self;//设置代理

picker.allowsEditing = YES;//设置照片可编辑

picker.sourceType = sourceType;

//picker.showsCameraControls = NO;//默认为YES

//创建叠加层

UIView *overLayView=[[UIView alloc]initWithFrame:CGRectMake(0, 120, 320, 254)];

//取景器的背景图片，该图片中间挖掉了一块变成透明，用来显示摄像头获取的图片；

UIImage *overLayImag=[UIImage imageNamed:@"zhaoxiangdingwei.png"];

UIImageView *bgImageView=[[UIImageView alloc]initWithImage:overLayImag];

[overLayView addSubview:bgImageView];

picker.cameraOverlayView=overLayView;

picker.cameraDevice=UIImagePickerControllerCameraDeviceFront;//选择前置摄像头或后置摄像头

[self presentViewController:picker animated:YES completion:^{

}];

}

else {

NSLog(@"该设备无相机");

} }

从相册获取图片的方式：

//从相册获取图片

- (IBAction)photoFromAlbum:(id)sender {

UIImagePickerController *pickerImage = [[UIImagePickerController alloc] init];

if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {

pickerImage.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

//pickerImage.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;

pickerImage.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:pickerImage.sourceType];

}

pickerImage.delegate = self;

pickerImage.allowsEditing = NO;

[self presentViewController:pickerImage animated:YES completion:^{

}];

}

从相册或相机选择图片之后的操作：

//从相册选择图片后操作

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

[picker dismissViewControllerAnimated:YES completion:^{

}];

//NSLog(@"%@",info);

//保存原始图片

UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

[self saveImage:image withName:@"currentImage.png"];

}

保存选择的图片并显示在控件上：

//保存图片

- (void) saveImage:(UIImage *)currentImage withName:(NSString *)imageName {

NSData *imageData = UIImageJPEGRepresentation(currentImage, 0.5);

// 获取沙盒目录

NSString *fullPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:imageName];

// 将图片写入文件

[imageData writeToFile:fullPath atomically:NO];

//将选择的图片显示出来

[self.photoImage setImage:[UIImage imageWithContentsOfFile:fullPath]];

//将图片保存到disk

UIImageWriteToSavedPhotosAlbum(currentImage, nil, nil, nil);}

取消操作时调用的方法：

//取消操作时调用

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

[picker dismissViewControllerAnimated:YES completion:^{

}];

}

DEMO下载地址 ：http://download.csdn.net/download/u011918080/6932721