IOS Flashlight Code and understanding

1, first introduce avfoundation.framework frame

2. h file

Add #import <AVFoundation/AVFoundation.h>

@interface Lightviewcontroller:uiviewcontroller

{

BOOL Islighton;

Avcapturedevice *device;

}

@property BOOL Islighton;

@end

3. m file

#import "LightViewController.h"

@interface Lightviewcontroller ()

@end

@implementation Lightviewcontroller

@synthesize Islighton;

-(ID) Initwithnibname: (NSString *) Nibnameornil Bundle: (nsbundle*) Nibbundleornil

{

self = [super InitWithNibName:nibNameOrNilbundle:nibBundleOrNil];

if (self) {

Self.navigationItem.title = @ "Flashlight";

}

return self;

}

-(void) viewdidload

{

[Super Viewdidload];

UIButton *btn = [Uibuttonbuttonwithtype:uibuttontyperoundedrect];

[Btn Setframe:cgrectmake (80, 150, 100, 80)];

[Btn addtarget:self Action: @selector (btnclicked) forcontrolevents:uicontroleventtouchupinside];

[Self.view ADDSUBVIEW:BTN];

Avcapturedevice represents an abstract hardware device

To find a suitable avcapturedevice

device = [Avcapturedevicedefaultdevicewithmediatype:avmediatypevideo];

if (![ Device Hastorch]) {//Determine if there is a flash

Uialertview *alter = [[uialertviewalloc]initwithtitle:@] Prompt "message:@" The current device does not have a flash and cannot provide a flashlight function "Delegate:nil cancelbuttontitle:@ "Cancel" otherbuttontitles:nil, nil];

[Alter show];

[Alter release];

}

Islighton = NO;

}

-(void) btnclicked

{

Islighton = 1-islighton;

if (Islighton) {

[Self turnonled:yes];

}else{

[Self turnoffled:yes];

}

}

Turn on the flashlight

-(void) turnonled: (BOOL) update

{

[Device Lockforconfiguration:nil];

[Device Settorchmode:avcapturetorchmodeon];

[Device unlockforconfiguration];

}

Turn off the flashlight

-(void) turnoffled: (BOOL) update

{

[Device Lockforconfiguration:nil];

[Device Settorchmode:avcapturetorchmodeoff];

[Device unlockforconfiguration];

}

IOS Flashlight Code and understanding