Tenn's WorkSpace

//UITextFieldDelegate 선언후...

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {

    if(textField.text.length + string.length - range.length > 15){

        return NO;

    }

    return YES;

}

Document 디렉토리 비우기 (서브디렉토리 & 파일 지우기)

   NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

   NSArray *fileList = [filemgr subpathsAtPath:[paths objectAtIndex:0]];

   for(int i=0; i < fileList.count; i++){

            NSString *subPath = [fileList objectAtIndex:i];

            NSLog(@"%d : %@", i, subPath);

            NSString *currentPath = [NSString stringWithFormat:@"%@/%@", [paths objectAtIndex:0], subPath];

            [filemgr removeItemAtPath:currentPath error:NULL];

   }

파일 생성일

            NSDictionary* fileAttribs = [[NSFileManager defaultManager] attributesOfItemAtPath:path error:nil];

            NSDate *result = [fileAttribs fileCreationDate]; //or fileModificationDate

http://stackoverflow.com/questions/3642013/objective-c-get-file-creation-date

//동작확인

// xcode 4.6

// ipod touch 5th

.h

//delegate

@interface ViewController : UIViewController <UITextFieldDelegate>

.m

- (void)viewDidLoad

{

    [super viewDidLoad];

    tf.delegate = self;

}

- (BOOL)textFieldShouldReturn:(UITextField *)textField{

    if(textField == tf){

        [textField resignFirstResponder];

    }

    return YES;

}

EXC_BAD_ACCESS → ZombieObject 설정

EditSchme > 해당스킴 > Diagnostics > Memory Management

     Enable Zombie Objects

참고 : http://xinics.tistory.com/66

.h

<UINavigationControllerDelegate, UIImagePickerControllerDelegate>

////////////

.m

- (IBAction)tapBtn:(id)sender {

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

    pickerLibrary.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    [pickerLibrary setAllowsEditing:YES];

    pickerLibrary.delegate = self;

    //[self presentModalViewController:pickerLibrary animated:YES];

   //deprecated in iOS6

    [self presentViewController:pickerLibrary animated:YES completion:nil];

}

- (void) imagePickerController:(UIImagePickerController * )picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo{

    targetImage = image; 

    [self dismissViewControllerAnimated:YES completion:nil];    

}

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

    [self dismissViewControllerAnimated:YES completion:nil];   

}

    UITapGestureRecognizer *pressGesture =

    [[UITapGestureRecognizer alloc] initWithTarget:self

                                                  action:@selector(doSomethingMethod)];

    [targetView addGestureRecognizer:pressGesture];

< framework import > 

GPUImage framework를 다운로드 받아서, 임포트할 프로젝트에 둔다.

xcode에서 프로젝트 Frameworks에 GPUImage.xcodeproj를 드래그

GPUImage를 빌드 -> product에 libGPUImage.a 생성

BuildPhase > Target Dependencies 에 libGPUImage를 추가

BuildPhase > Link Binary Libraries 에 다음의 프레임워크추가

CoreMedia, CoreVideo, OpenGLES, AVFoundation, QuatzCore

libGPUImage도 라이브러리에 추가

BuildSetting > Search paths > header search pathes

GPUImage framework의 루트를 지정(xcodeproj가 있는 폴더)

recursive로 지정

Header Search pathes에 지정하면 Debug와 Release에 같은 값이 지정된다.

예 > GPUImage/framework  

코딩할 문서에서 

#import "GPUImage.h"  <- 자동완성이 안되면 header search path지정이 잘못된 것

코딩... 코딩... 코딩...

Introducing the GPUImage framework

http://sunsetlakesoftware.com/2012/02/12/introducing-gpuimage-framework

간단한 예제 : 감마필터 적용시키기

    CGRect mainScreenFrame = [[UIScreen mainScreen] applicationFrame];

GPUImageView *primaryView = [[GPUImageView alloc] initWithFrame:mainScreenFrame];

self.view = primaryView;

    UIImage *inputImage = [UIImage imageNamed:@"x.png"];

    GPUImagePicture *picture = [[GPUImagePicture alloc] initWithImage:inputImage];

    GPUImageGammaFilter *g = [[GPUImageGammaFilter alloc] init];

    [g setGamma:0.2];

    [picture addTarget:g];

    [g addTarget:primaryView];

    [picture processImage];

UIView *target = [[UIApplication sharedApplication].windows objectAtIndex:0];

UIView *vv = [[UIView alloc] initWithFrame:CGRectMake(0, 0, target.bounds.size.width, target.bounds.size.height)];

vv.backgroundColor = [UIColor redColor];

[target addSubview:vv];

http://pulsebeat.tistory.com/27

참고 : http://paperinz.com/817

http://j2enty.tistory.com/76

#import <CoreMotion/CoreMotion.h>

    self.motionManager = [[CMMotionManager alloc] init];

    //Gyroscope

    if([self.motionManager isGyroAvailable])

    {

        /* Start the gyroscope if it is not active already */ 

        if([self.motionManager isGyroActive] == NO)

        {

            /* Update us 2 times a second */

            [self.motionManager setGyroUpdateInterval:1.0f / 2.0f];

            /* And on a handler block object */

            /* Receive the gyroscope data on this block */

            [self.motionManager startGyroUpdatesToQueue:[NSOperationQueue mainQueue]

             withHandler:^(CMGyroData *gyroData, NSError *error)

            {

                NSString *x = [[NSString alloc] initWithFormat:@"%.02f",gyroData.rotationRate.x];

                self.gyro_xaxis.text = x;

                NSString *y = [[NSString alloc] initWithFormat:@"%.02f",gyroData.rotationRate.y];

                self.gyro_yaxis.text = y;

                NSString *z = [[NSString alloc] initWithFormat:@"%.02f",gyroData.rotationRate.z];

                self.gyro_zaxis.text = z;

            }];

        }

    }

    else

    {

        NSLog(@"Gyroscope not Available!");

    }

}

http://stackoverflow.com/questions/7135934/ios-gyroscope-api

http://stackoverflow.com/questions/5009135/uilongpressgesturerecognizer-turns-off-uibutton-highlighting