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CATransition* transition = [CATransition animation];
transition.duration = 0.4;
transition.type = kCATransitionFade;
transition.subtype = kCATransitionFromBottom;
[self.navigationController.view.layer addAnimation:transition forKey:kCATransition];
[self.navigationController pushViewController:adjustViewController animated:NO];

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pixelmator
http://help.pixelmator.com/#118

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    NSArray *familyNames = [[NSArray alloc] initWithArray:[UIFont familyNames]];
    NSArray *fontNames;
    NSInteger indFamily, indFont;
    for(indFamily=0;indFamily<[familyNames count];++indFamily)
    {
        NSLog(@"Family name: %@", [familyNames objectAtIndex:indFamily]);
        fontNames =[[NSArray alloc]initWithArray:[UIFont fontNamesForFamilyName:[familyNames objectAtIndex:indFamily]]];
        for(indFont=0; indFont<[fontNames count]; ++indFont)
        {
            NSLog(@" Font name: %@",[fontNames objectAtIndex:indFont]);

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因为播放器只支持播放NSURL参数的资源，所以要播放本地文件时，需要将路径参数转化为
本地路径构造URL，使用NSURL 提供的静态方法fileURLWithPath

Creating an NSURL
– initWithScheme:host:path:
+ URLWithString:
– initWithString:
+ URLWithString:relativeToURL:
– initWithString:relativeToURL:
+ fileURLWithPath:isDirectory:

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1. 安装Ubuntu Server版本


2. 更新软件源 
sudo apt-get update 

3. 安装open-ssh
sudo apt-get install openssh-server

4. 提升ssh认証时间

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BOOL isCameraValid = YES;  
//判断iOS7的宏，没有就自己写个，下边的方法是iOS7新加的，7以下调用会报错  
if(isIOS7AndLater)  
        {  
            AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];  
            if (authStatus != AVAuthorizationStatusAuthorized)  
            {  
                isCameraValid = NO;  
            }  
        }  

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        [self.motionManager startDeviceMotionUpdatesToQueue:[NSOperationQueue currentQueue] withHandler:^(CMDeviceMotion *motion,NSError *error){
            double gravityX = motion.gravity.x;
           
            double gravityY = motion.gravity.y;
           
            double gravityZ = motion.gravity.z;

            NSLog(@"gravityX = %f",gravityX);
           
            NSLog(@"gravityY = %f",gravityY);

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#import <CommonCrypto/CommonDigest.h>

- (NSString *)md5HexDigest:(NSString*)password
{
    const char *original_str = [password UTF8String];
    unsigned char result[CC_MD5_DIGEST_LENGTH];
    CC_MD5(original_str, strlen(original_str), result);
    NSMutableString *hash = [NSMutableString string];
    for (int i = 0; i < 16; i++)
    {

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NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];

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btn.contentHorizontalAlignment = UIControlContentHorizonAlignmentLeft;