iOS 打开系统相册和使用相机

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<UITextViewDelegate,UIActionSheetDelegate,UINavigationControllerDelegate,UIImagePickerControllerDelegate>

{
//输入框
UITextView *_textEditor;
//下拉菜单
UIActionSheet *myActionSheet;
//图片2进制路径
NSString* filePath;
}
@end

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
UIButton *button = [[UIButton alloc]init];
button.frame = CGRectMake(0, 120, 80, 80);
button.backgroundColor = [UIColor redColor];
[button addTarget:self action:@selector(openMenu) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
float i = [self fileSizeForDir:NSHomeDirectory()];
NSLog(@"%f", i);
}

-(void)openMenu
{
myActionSheet = [[UIActionSheet alloc]
initWithTitle:nil
delegate:self
cancelButtonTitle:@"取消"
destructiveButtonTitle:nil
otherButtonTitles: @"打开照相机", @"从手机相册获取",nil];
[myActionSheet showInView:self.view];
}
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
//呼出的菜单按钮点击后的响应
if (buttonIndex == myActionSheet.cancelButtonIndex)
{
NSLog(@"取消");
}
switch (buttonIndex)
{
case 0:  //打开照相机拍照
[self takePhoto];
break;
case 1:  //打开本地相册
[self LocalPhoto];
break;
}
}
//开始拍照
-(void)takePhoto
{
UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;
if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera])
{
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
//设置拍照后的图片可被编辑
//        picker.allowsEditing = YES;
picker.sourceType = sourceType;
[self presentModalViewController:picker animated:YES];
}else
{
NSLog(@"模拟其中无法打开照相机,请在真机中使用");
}
}
//打开本地相册
-(void)LocalPhoto
{
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
picker.delegate = self;
//设置选择后的图片可被编辑
//    picker.allowsEditing = YES;
[self presentModalViewController:picker animated:YES];
}
//当选择一张图片后进入这里
-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSString *type = [info objectForKey:UIImagePickerControllerMediaType];
//当选择的类型是图片
if ([type isEqualToString:@"public.image"])
{
//先把图片转成NSData
UIImage* image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
NSData *data;
if (UIImagePNGRepresentation(image) == nil)
{
data = UIImageJPEGRepresentation(image, 1.0);
}
else
{
data = UIImagePNGRepresentation(image);
}
//图片保存的路径
//这里将图片放在沙盒的documents文件夹中
NSString * DocumentsPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
//文件管理器
NSFileManager *fileManager = [NSFileManager defaultManager];
//把刚刚图片转换的data对象拷贝至沙盒中 并保存为image.png
[fileManager createDirectoryAtPath:DocumentsPath withIntermediateDirectories:YES attributes:nil error:nil];
[fileManager createFileAtPath:[DocumentsPath stringByAppendingString:@"/image.png"] contents:data attributes:nil];
//得到选择后沙盒中图片的完整路径
filePath = [[NSString alloc]initWithFormat:@"%@%@",DocumentsPath,  @"/image.png"];
//关闭相册界面
[picker dismissModalViewControllerAnimated:YES];
//创建一个选择后图片的小图标放在下方
//类似微薄选择图后的效果
UIImageView *smallimage = [[UIImageView alloc] initWithFrame:
CGRectMake(50, 120, 40, 40) ];
smallimage.image = image;
//加在视图中
[self.view addSubview:smallimage];
}
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
NSLog(@"您取消了选择图片");
[picker dismissModalViewControllerAnimated:YES];
}
-(void)sendInfo
{
NSLog(@"图片的路径是：%@", filePath);
}
- (float)fileSizeForDir:(NSString*)path//计算文件夹下文件的总大小

{

NSFileManager *fileManager = [[NSFileManager alloc] init];

float size =0;

NSArray* array = [fileManager contentsOfDirectoryAtPath:path error:nil];

for(int i = 0; i<[array count]; i++)

{

NSString *fullPath = [path stringByAppendingPathComponent:[array objectAtIndex:i]];

BOOL isDir;

if ( !([fileManager fileExistsAtPath:fullPath isDirectory:&isDir] && isDir) )

{

NSDictionary *fileAttributeDic=[fileManager attributesOfItemAtPath:fullPath error:nil];

size+= fileAttributeDic.fileSize/ 1024.0/1024.0;

}

else

{

[self fileSizeForDir:fullPath];

}

}

return size;

}

- (void)viewDidUnload
{
[super viewDidUnload];
//  any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
// Do any additional setup after loading the view, typically from a nib.
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end