IOS研究院之打开照相机与本地相册选择图片

如下图所示 在本地相册中选择一张图片后，我们将他拷贝至沙盒当中，在客户端中将它的缩略图放在按钮旁边，这个结构其实和新浪微薄中选择图片后的效果一样。最终点击发送将按钮将图片2进制图片上传服务器。

下面我们仔细学习具体的细节。创建一个空的IOS项目，接着在创建一个ViewController。

AppDelegate.h 应用的代理类 这个没什么好说的就是直接打开刚刚创建的新ViewController。

1	#import <UIKit/UIKit.h>

2	#import "TestViewController.h"

3

4	@interface AppDelegate : UIResponder <UIApplicationDelegate>

5

6	@property (strong, nonatomic) UIWindow *window;

7	@property (strong, nonatomic) UINavigationController *navController;

8	@property (strong, nonatomic) UIViewController *viewController;

9

@end

AppDelegate.m 在这里就是打开我们创建的TestViewController

01	#import "AppDelegate.h"

02

03	@implementation AppDelegate

04

05	@synthesize window = _window;

06	@synthesize navController;

07	@synthesize viewController;

08

09	- (void)dealloc

10

{

11	[_window release];

12	[super dealloc];

13

}

14

15	- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

16

{

17	self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];

18

19	self.window.backgroundColor = [UIColor whiteColor];

20	self.viewController =  [[TestViewController alloc]init];

21	self.navController = [[UINavigationController alloc] initWithRootViewController:self.viewController];

22	[self.window addSubview:navController.view];

23

24	[self.window makeKeyAndVisible];

25	return YES;

26

}

27

28

@end

TestViewController.h 注意这里面引入了很多代理类。

01	#import <UIKit/UIKit.h>

02

03	@interface TestViewController : UIViewController<UITextViewDelegate,UIActionSheetDelegate,UINavigationControllerDelegate,UIImagePickerControllerDelegate>

04

{

05

//输入框

06	UITextView *_textEditor;

07

08

//下拉菜单

09	UIActionSheet *myActionSheet;

10

11

//图片2进制路径

12	NSString* filePath;

13

}

14

@end

TestViewController.m 请大家仔细看这个类， 所有的东西都写在了这里哈。

001	#import "TestViewController.h"

002

003	@interface TestViewController ()

004

005

@end

006

007	@implementation TestViewController

008

009	- (void)viewDidLoad

010

{

011	[super viewDidLoad];

012

//导航栏标题

013	self.navigationItem.title = @"雨松MOMO输入框";

014

015

//导航栏按钮

016	self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc]

017	initWithTitle: @"发送"

018	style: UIBarButtonItemStyleDone

019	target: self

020	action: @selector(sendInfo)] autorelease];

021

022

//输入框显示区域

023	_textEditor = [[UITextView alloc] initWithFrame:CGRectMake(0, 0, 320, 100)];

024

//设置它的代理

025	_textEditor.delegate = self;

026	_textEditor.autoresizingMask = UIViewAutoresizingFlexibleWidth;

027	_textEditor.keyboardType = UIKeyboardTypeDefault;

028	_textEditor.font = [UIFont systemFontOfSize:20];

029	_textEditor.text = @"请输入内容";

030

031	//默认软键盘是在触摸区域后才会打开

032	//这里表示进入当前ViewController直接打开软键盘

033	[_textEditor becomeFirstResponder];

034

035	//把输入框加在视图中

036	[self.view addSubview:_textEditor];

037

038	//下方的图片按钮 点击后呼出菜单 打开摄像机 查找本地相册

039	UIImage *image = [[UIImage alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"camera" ofType:@"png"]];

040

041	UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

042	button.frame = CGRectMake(0, 120, image.size.width, image.size.height);

043

044	[button setImage:image forState:UIControlStateNormal];

045

046	[button addTarget:self action:@selector(openMenu) forControlEvents:UIControlEventTouchUpInside];

047

048	//把它也加在视图当中

049	[self.view addSubview:button];

050

051

}

052

053	-(void)openMenu

054

{

055	//在这里呼出下方菜单按钮项

056	myActionSheet = [[UIActionSheet alloc]

057	initWithTitle:nil

058	delegate:self

059	cancelButtonTitle:@"取消"

060	destructiveButtonTitle:nil

061	otherButtonTitles: @"打开照相机", @"从手机相册获取",nil];

062

063	[myActionSheet showInView:self.view];

064	[myActionSheet release];

065

066

}

067

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

069

{

070

071	//呼出的菜单按钮点击后的响应

072	if (buttonIndex == myActionSheet.cancelButtonIndex)

073

{

074	NSLog(@"取消");

075

}

076

077	switch (buttonIndex)

078

{

079	case 0:  //打开照相机拍照

080	[self takePhoto];

081

break;

082

083	case 1:  //打开本地相册

084	[self LocalPhoto];

085

break;

086

}

087

}

088

089

//开始拍照

090	-(void)takePhoto

091

{

092	UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;

093	if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera])

094

{

095	UIImagePickerController *picker = [[UIImagePickerController alloc] init];

096	picker.delegate = self;

097	//设置拍照后的图片可被编辑

098	picker.allowsEditing = YES;

099	picker.sourceType = sourceType;

100	[picker release];

101	[self presentModalViewController:picker animated:YES];

102

}else

103

{

104	NSLog(@"模拟其中无法打开照相机,请在真机中使用");

105

}

106

}

107

108

//打开本地相册

109	-(void)LocalPhoto

110

{

111	UIImagePickerController *picker = [[UIImagePickerController alloc] init];

112

113	picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

114	picker.delegate = self;

115	//设置选择后的图片可被编辑

116	picker.allowsEditing = YES;

117	[self presentModalViewController:picker animated:YES];

118	[picker release];

119

}

120

121	//当选择一张图片后进入这里

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

123

124

{

125

126	NSString *type = [info objectForKey:UIImagePickerControllerMediaType];

127

128	//当选择的类型是图片

129	if ([type isEqualToString:@"public.image"])

130

{

131	//先把图片转成NSData

132	UIImage* image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];

133	NSData *data;

134	if (UIImagePNGRepresentation(image) == nil)

135

{

136	data = UIImageJPEGRepresentation(image, 1.0);

137

}

138

else

139

{

140	data = UIImagePNGRepresentation(image);

141

}

142

143

//图片保存的路径

144	//这里将图片放在沙盒的documents文件夹中

145	NSString * DocumentsPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];

146

147

//文件管理器

148	NSFileManager *fileManager = [NSFileManager defaultManager];

149

150	//把刚刚图片转换的data对象拷贝至沙盒中 并保存为image.png

151	[fileManager createDirectoryAtPath:DocumentsPath withIntermediateDirectories:YES attributes:nil error:nil];

152	[fileManager createFileAtPath:[DocumentsPath stringByAppendingString:@"/image.png"] contents:data attributes:nil];

153

154	//得到选择后沙盒中图片的完整路径

155	filePath = [[NSString alloc]initWithFormat:@"%@%@",DocumentsPath,  @"/image.png"];

156

157

//关闭相册界面

158	[picker dismissModalViewControllerAnimated:YES];

159

160	//创建一个选择后图片的小图标放在下方

161	//类似微薄选择图后的效果

162	UIImageView *smallimage = [[[UIImageView alloc] initWithFrame:

163	CGRectMake(50, 120, 40, 40)] autorelease];

164

165	smallimage.image = image;

166

//加在视图中

167	[self.view addSubview:smallimage];

168

169

}

170

171

}

172

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

174

{

175	NSLog(@"您取消了选择图片");

176	[picker dismissModalViewControllerAnimated:YES];

177

}

178

179	-(void)sendInfo

180

{

181	NSLog(@"图片的路径是：%@", filePath);

182

183	NSLog(@"您输入框中的内容是：%@", _textEditor.text);

184

}

185

186	- (void)viewDidUnload

187

{

188	[super viewDidUnload];

189	// Release any retained subviews of the main view.

190

}

191

192	- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

193

{

194	return (interfaceOrientation == UIInterfaceOrientationPortrait);

195

}

196

197

@end

如下图所示，打开下拉菜单按钮开始选择打开相机 或者 打开本地相册。模拟器中是无法打开照相机的的，切记。

如下图所示，这里就是我本地的相册啦，里面保存了几张图片，选择一张即可。

我在这里再说说图片上传， 图片上传我们采用的是2进制ASIHTTPRequest 来完成的。

发送请求

01	NSString *server_base = [NSString stringWithFormat:@"%@/users/uploadResource.json", _server];

02

03	ASINetworkQueue *queue = [[ASINetworkQueue alloc] init];

04

05	ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:[NSURL URLWithString:server_base]];

06

07	[ASIHTTPRequest setShouldUpdateNetworkActivityIndicator: NO];

08	[request setDelegate :self];

09	[request setDidFinishSelector:@selector(sendCommentSucc:)];

10	[request setDidFailSelector:@selector(sendCommentFail:)];

11	// res 就是 需要上传图片文件的路径

12	[request setFile:res forKey:@"res"];

13

14	[queue addOperation:request];

15	[queue go];

最后是文本的源码下载地址：http://vdisk.weibo.com/s/accm9