iOS development calls system camera and turns on flash

iOS development calls system camera and turns on flash

Today to share with you how to call the iphone's camera function and turn on the flash, some code I do not understand, many are on the internet to learn from others. iOS has two ways to take photos and videos: 1. Using Uiimagepickercontroller directly, this class provides a simple and convenient way to take photos and select pictures in the Image library. 2. The other is to fully customize the picture-taking interface and select the image Library interface through the Avfoundation.framework framework. I only did the first one, I will first introduce you to the first way:
First, before calling the interface, we need to first determine whether the current device supports Uiimagepickercontroller, using issourcetypeavailable: To determine whether it is available
Second, look at the type of media that matches, this time we call Availablemediatypeforsourcetype: Judge
We need to add his two proxy methods when calling Uiimagepickercontroller:
Uinavigationcontrollerdelegate and Uiimagepickercontrollerdelegate, you can also adjust the flash when you call the camera, there is in the code.

To invoke the flash you need to first build an instance object of the Avcapturesession class:

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1. #import <uikit/uikit.h>   
2. //call the Flash call frame   
3. #IMPORT&NBSP;<AVFOUNDATION/AVFOUNDATION.H>&NBSP;&NBSP;
4.    
5. @interface  CameraViewController : UIViewController< uinavigationcontrollerdelegate, uiimagepickercontrollerdelegate>  
6. {   
7.     avcapturesession * _avsession;
8. }  
9. &NBSP;&NBSP;&NBSP;
10. @property (nonatomic,retain) avcapturesession * avsession;  
Li class= "alt" >&NBSP;&NBSP;&NBSP;
11. @end   

In. m-(void) Viewdidload build 4button,camera call camera, library call Photo Gallery, flashlight Open flash, close close flash

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2. Turn on the camera
4. -(void) Addcarema
6. {
8. //Determine if camera can be turned on, simulator this function is not available
10. if ([Uiimagepickercontroller Issourcetypeavailable:uiimagepickercontrollersourcetypecamera]) {
14. Uiimagepickercontroller * Picker = [[Uiimagepickercontroller alloc]init];
16. Picker.delegate = self;
18. picker.allowsediting = YES; //whether editable
20. //Camera
22. Picker.sourcetype = Uiimagepickercontrollersourcetypecamera;
24. [Self presentmodalviewcontroller:picker animated:yes];
26. [Picker release];
28. }else{
30. //If the user is not prompted
32. Uialertview *alert = [[Uialertview alloc] initwithtitle:@"Error" message:@"You don't have a webcam" delegate:nil  cancelbuttontitle:@"drat!" otherbuttontitles:nil];
34. [Alert show];
36. }
38. }

After you open the camera, then you need to call the method in Uiimagepickercontrollerdelegate, the method that is executed after the shot is completed, and the method that executes after clicking Cancel:

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2. The method to be executed after the shooting is completed
4. -(void) Imagepickercontroller: (Uiimagepickercontroller *) Picker Didfinishpickingmediawithinfo: (NSDictionary *) Info
6. {
8. //Get Pictures
10. UIImage * image = [info objectforkey:uiimagepickercontrolleroriginalimage];
12. //images in albums
14. Uiimagewritetosavedphotosalbum (image, nil, nil, nil);
16. [Self dismissmodalviewcontrolleranimated:yes];
20. }
22. To execute a method after clicking the Cancel button
24. -(void) Imagepickercontrollerdidcancel: (Uiimagepickercontroller *) Picker
26. {
28. [Self dismissmodalviewcontrolleranimated:yes];
30. }

Call camera photo and save to Picture Library has completed.
Next, open photo Gallery:

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2. -(void) openpiclibrary
4. {
6. //albums can be opened with an emulator
8. if ([Uiimagepickercontroller issourcetypeavailable:uiimagepickercontrollersourcetypephotolibrary]) {
10. Uiimagepickercontroller * Picker = [[Uiimagepickercontroller alloc]init];
12. Picker.delegate = self;
14. picker.allowsediting = YES; //Whether you can edit
18. //Open album Select Photos
20. Picker.sourcetype = uiimagepickercontrollersourcetypephotolibrary;
22. [Self presentmodalviewcontroller:picker animated:yes];
24. [Picker release];
26. }else{
28. Uialertview *alert = [[Uialertview alloc] initwithtitle:@"Error" message:@"You don't have a webcam" delegate:nil  cancelbuttontitle:@"drat!" otherbuttontitles:nil];
30. [Alert show];
32. }
36. }
40. Select the proxy method for the image to enter
42. -(void) Imagepickercontroller: (Uiimagepickercontroller *) Picker didfinishpickingimage: (UIImage *) image Editinginfo: (nsdictionary *) Editinginfo
44. {
46. [Self dismissmodalviewcontrolleranimated:yes];
48. }

Code to call the Flash

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2. -(void) Openflashlight
4. {
6. Avcapturedevice * device = [Avcapturedevice defaultdevicewithmediatype:avmediatypevideo];
8. if (Device.torchmode = = Avcapturetorchmodeoff) {
10. //create an AV session
12. Avcapturesession * session = [[Avcapturesession alloc]init];
16. //Create device input and add to current session
18. Avcapturedeviceinput * input = [avcapturedeviceinput deviceinputwithdevice:device error:nil];
20. [Session Addinput:input];
24. //Create video output and add to current session
26. Avcapturevideodataoutput * output = [[Avcapturevideodataoutput alloc]init];
28. [Session Addoutput:output];
32. //Start session configuration
34. [Session beginconfiguration];
36. [Device Lockforconfiguration:nil];
40. //Set torch to On
42. [Device Settorchmode:avcapturetorchmodeon];
46. [Device unlockforconfiguration];
48. [Session commitconfiguration];
52. //Start the session
54. [Session startrunning];
58. //Keep the session around
60. [Self setavsession:self. Avsession];
64. [Output RELEASE];
66. }
68. }
72. -(void) Closeflashlight
74. {
76. [Self. Avsession stoprunning];
78. [Self. Avsession release];
80. }

iOS development calls system camera and turns on flash