一些常用的知识（一）

1获取系统语言设置
 
     NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
 
     NSArray *languages = [userDefault objectForKey:@"AppleLanguages"];
 
     NSString *preferredLang = [languages objectAtIndex:0];
 
2
 
缓存路径下文件大小
 
 
- (unsigned long long int) cacheFolderSize 
 
{
 
    NSFileManager  *_manager = [NSFileManager defaultManager];
 
    NSArray *_cachePaths =  NSSearchPathForDirectoriesInDomains(NSCachesDirectory,
                                                NSUserDomainMask, YES);
 
    NSString  *_cacheDirectory = [_cachePaths objectAtIndex:]; 
 
    NSArray  *_cacheFileList;
 
    NSEnumerator *_cacheEnumerator;
 
    NSString *_cacheFilePath;
 
    unsigned long long int _cacheFolderSize = ;
 
    _cacheFileList = [ _manager subpathsAtPath:_cacheDirectory];
 
   _cacheEnumerator = [_cacheFileList objectEnumerator];
 
    while (_cacheFilePath = [_cacheEnumerator nextObject]) 
 
   {
 
         NSDictionary *_cacheFileAttributes = [_managerfileAttributesAtPath:  
 
         [_cacheDirectory   stringByAppendingPathComponent:_cacheFilePath]
 
         traverseLink:YES];
 
      _cacheFolderSize += [_cacheFileAttributes fileSize];
 
    }
 
// 单位是字节
 
    return _cacheFolderSize;
 
}
 
3Popover push 时 Frame无法改变解决办法
 
在popover中的ViewController中实现：
 
- (void)viewWillAppear:(BOOL)animated 
{
 
   CGSize size = CGSizeMake(320, 480); // size of view in popover  
 
   self.contentSizeForViewInPopover = size; 
 
   [super viewWillAppear:animated]; 
 
}
 
4tableview滑动导致NSTimer和委托回调停止解决办法
 
/ /请求回调
 
NSURLRequest  * 请求  =  ...
 
scheduleInRunLoop ：[ NSRunLoop  currentRunLoop ] 
                                            forMode ：NSRunLoopCommonModes ] 
[ 连接开始] / /定时器回调
 
NSTimer * updateTimer = [NSTimer scheduledTimerWithTimeInterval：0.01f目标：自我选择：选择（updatePencent）的UserInfo：无重复：是];
 
* NSRunLoop主要= [NSRunLoop currentRunLoop] 
[主要addTimer：updateTimer forMode：NSRunLoopCommonModes];
 
5手势识别类
 
UIGestureRecognizer
 
 
6SFHFKeychainUtils 存储信息
 
苹果SDK自带的就有密码保护，使用方法很简单，如下：
 
1、引入Security.frameWork框架。
 
2、引入头文件：SFHKeychainUtils.h.
 
3、存密码：
 
[SFHFKeychainUtils storeUsername:@"dd" andPassword:@"aa"forServiceName:SERVICE_NAMEupdateExisting:1 error:nil];
 
[SFHFKeychainUtils deleteItemForUsername:@"dd" andServiceName:SERVICE_NAME error:nil];
 
4、取密码：
 
NSString *passWord =  [SFHFKeychainUtils getPasswordForUsername:@"dd"andServiceName:SERVICE_NAMEerror:nil];
 
7missing required architecture i386 in file 解决办法
 
在TargetInfo里面修改 Framework Search Pasths 删除里面内容就可以了。
 
 
8view 放大缩小动画效果
 
//创建缩小了的视图
myWeiBoImageVC = [[UIViewController alloc] init];
myWeiBoImageVC.view.clipsToBounds = YES;
myWeiBoImageVC.view.alpha = 0.0;
myWeiBoImageVC.view.frame = CGRectMake(64, 0, 1024-64, 768-20);
[self.view addSubview:myWeiBoImageVC.view];
     
CGAffineTransform newTransform = 
CGAffineTransformScale(myWeiBoImageVC.view.transform, 0.1, 0.1);
[myWeiBoImageVC.view setTransform:newTransform];
myWeiBoImageVC.view.center = CGPointMake(670, 100);
  
[self performSelector:@selector(imageViewControllerBigAnimation)];
 
//放大刚刚创建缩小后的视图
- (void)imageViewControllerBigAnimation{
    
    [UIView beginAnimations:@"imageViewBig" context:nil];
    [UIView setAnimationDuration:0.5];   
    CGAffineTransform newTransform =            CGAffineTransformConcat(myWeiBoImageVC.view.transform,  CGAffineTransformInvert(myWeiBoImageVC.view.transform));
    [myWeiBoImageVC.view setTransform:newTransform];
    myWeiBoImageVC.view.alpha = 1.0;
    myWeiBoImageVC.view.center = CGPointMake(416, 510)；
    [UIView commitAnimations];
    
}
 
//缩小视图 隐藏
 
- (void)imageViewControllerSmallAnimation{
 
    [UIView beginAnimations:@"imageViewSmall" context:nil];
    [UIView setAnimationDuration:0.5];
    CGAffineTransform newTransform =  CGAffineTransformScale(myWeiBoImageVC.view.transform, 0.1, 0.1);
    [myWeiBoImageVC.view setTransform:newTransform];
    myWeiBoImageVC.view.center = CGPointMake(670, 100);
    [UIView commitAnimations];
    
}
 
9UIScrollView 控制View缩放
 
allImageScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 768, 1024)];
allImageScrollView.minimumZoomScale = 0.3;
allImageScrollView.maximumZoomScale = 1.0;
allImageScrollView.backgroundColor = [UIColor clearColor];
allImageScrollView.delegate = self;
[self.view addSubview:allImageScrollView];
 
mPicStatusesViewController = [[PicStatusesViewController alloc] init];
[allImageScrollView addSubview:mPicStatusesViewController.view];
 
//UIScrollView Delegete 实现
 
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
 
{
    return mPicStatusesViewController.view; //返回ScrollView上添加的需要缩放的视图
}
 
- (void)scrollViewDidZoom:(UIScrollView *)scrollView
 
{
    //缩放操作中被调用
}
 
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale
 
{
    //缩放结束后被调用
  }
 
10、iOS3.2 播放视频
 
NSString *urlString = [NSString stringWithString:@"视频url"];
 
NSURL *movieUrl = [[NSURL alloc] initWithString:urlString];
     
MPMoviePlayerController *myMoviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:movieUrl];
myMoviePlayer.view.frame = CGRectMake(250, 250, 350, 350);
[self.view addSubview:myMoviePlayer.view];    
myMoviePlayer.shouldAutoplay = YES;
myMoviePlayer.scalingMode= MPMovieScalingModeAspectFit;  
[myMoviePlayer play];
 
 
11、谷歌地图翻起动画效果
 
    CATransition *animation = [CATransition animation];
    [animation setDelegate:self];
    [animation setDuration:0.35];
    [animation setTimingFunction:UIViewAnimationCurveEaseInOut];
    if (!curled){
 
        animation.type = @"pageCurl";
        animation.fillMode = kCAFillModeForwards;
        animation.endProgress = 0.40;
    } else {
        animation.type = @"pageUnCurl";
        animation.fillMode = kCAFillModeBackwards;
        animation.startProgress = 0.30;
    }
    [animation setRemovedOnCompletion:NO];
    [self.view exchangeSubviewAtIndex:0 withSubviewAtIndex:1];
     
    [self.view.layer addAnimation:animation forKey:@"pageCurlAnimation"];
 
12、给View添加阴影 和边框
 
UIImageView *imgvPhoto  = [UIImageView alloc] init];
 
//添加边框
   CALayer *layer = [_imgvPhoto layer];
    layer.borderColor = [[UIColor whiteColor] CGColor];
    layer.borderWidth = 5.0f;
//添加四个边阴影
    _imgvPhoto.layer.shadowColor = [UIColor blackColor].CGColor;
    _imgvPhoto.layer.shadowOffset = CGSizeMake(0, 0);
    _imgvPhoto.layer.shadowOpacity = 0.5;
    _imgvPhoto.layer.shadowRadius = 10.0;
//添加两个边阴影
    _imgvPhoto.layer.shadowColor = [UIColor blackColor].CGColor;
    _imgvPhoto.layer.shadowOffset = CGSizeMake(4, 4);
    _imgvPhoto.layer.shadowOpacity = 0.5;
    _imgvPhoto.layer.shadowRadius = 2.0;
 
13、使用NSTimer与UIView动画实现飘雪效果
 
viewDidLoad事件中，增加一个图片及定时器并启动,这里的pic请在头文件中定义。
 
-(void)viewDidLoad{
 [super viewDidLoad];
 self.pic = [UIImage imageNamed:@"snow.png"];//初始化图片
 //启动定时器，实现飘雪效果
 [NSTimer scheduledTimerWithTimeInterval:(0.2) target:self selector:@selector(ontime) userInfo:nil repeats:YES];
}
 
然后再实现定时器定时调用的ontime方法：
-(void)ontime{
 UIImageView *view = [[UIImageView alloc] initWithImage:pic];//声明一个UIImageView对象，用来添加图片
 view.alpha = 0.5;//设置该view的alpha为0.5，半透明的
 int x = round(random()20);//随机得到该图片的x坐标
 int y = round(random()20);//这个是该图片移动的最后坐标x轴的
 int s = round(random())+10;//这个是定义雪花图片的大小
 int sp = 1/round(random()0)+1;//这个是速度
 view.frame = CGRectMake(x, -50, s, s);//雪花开始的大小和位置
 [self.view addSubview:view];//添加该view
 [UIView beginAnimations:nil context:view];//开始动画
 [UIView setAnimationDuration:10*sp];//设定速度
 view.frame = CGRectMake(y, 500, s, s);//设定该雪花最后的消失坐标
 [UIView setAnimationDelegate:self];
 [UIView commitAnimations];
}
 
14、配置Xcode 看程序崩溃信息
 
1、在xcode中的左侧目录中找到Executables 打开
 
2、双击和工程名一样的文件。
 
3、在打开的文件中的Arguments选项，在下面的框中加入Name： NSZombieEnabled 设置value为YES。
 
15、程序中发送邮件和检测设备邮箱是否被配置
 
-(void)addEmail{
 
Class mailClass = (NSClassFromString(@"MFMailComposeViewController"));
 
if (mailClass != nil){
 
    if ([mailClass canSendMail]){
 
        [self displayComposerSheet];
 
    }else{
 
        [self launchMailAppOnDevice];
 
    }
 
}else{
 
    [self launchMailAppOnDevice];
 
    }
 
}
 
-(void)displayComposerSheet
 
{
 
MFMailComposeViewController *controller = [[MFMailComposeViewController alloc] init];
 
controller.navigationBar.tag = 1002;
 
[self.navigationController.navigationBar setNeedsDisplay];
 
controller.mailComposeDelegate = self;
 
[controller setSubject:@"意见反馈"];
 
[controller setToRecipients:[[NSArray alloc] initWithObjects:@"[email protected]",nil]];
 
NSString *emailBody = nil;
 
[controller setMessageBody:emailBody isHTML:YES];
 
[self presentModalViewController:controller animated:YES];
 
[controller release];
 
}
 
#pragma mark mailComposeDelegate ----
 
- (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error 
 
{
 
if (result == MFMailComposeResultSent) 
 
{
 
[self dismissModalViewControllerAnimated:YES];
 
}
 
if (result == MFMailComposeResultSaved) 
 
{
 
[self dismissModalViewControllerAnimated:YES];
 
}
 
if (result == MFMailComposeResultFailed) 
 
{
 
Emailalert = [[UIAlertView alloc] initWithTitle:@"" message:@"发送失败" delegate:selfcancelButtonTitle:@"知道了" otherButtonTitles:nil];
 
[Emailalert show];
 
}
 
if (result == MFMailComposeResultCancelled) 
 
{
 
[self dismissModalViewControllerAnimated:YES];
 
}
 
}
 
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
 
{
 
if(alertView == Emailalert)
 
{
 
if (buttonIndex == ) 
 
{
 
[self dismissModalViewControllerAnimated:YES];
 
}
 
}else
 
{
 
if (buttonIndex == ) 
 
{
 
//[self dismissModalViewControllerAnimated:YES];
 
}else
 
{
 
NSString *recipients = @"mailto:[email protected][email protected]&subject=text";
 
NSString *body = @"&body=text!";
 
NSString *email = [NSString stringWithFormat:@"%@%@", recipients, body];
 
email = [email stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
 
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:email]];
 
}
 
}
 
}
 
#pragma mark -
 
#pragma mark Workaround
 
-(void)launchMailAppOnDevice
 
{
 
isEmailalert = [[UIAlertView alloc] initWithTitle:@"警告" message:@"请配置您的邮箱" delegate:selfcancelButtonTitle:@"取消" otherButtonTitles:@"好的",nil];
 
[isEmailalert show];
 
}