IOS 冷门知识

来源：互联网发布：哈尔滨软件培训学校编辑：程序博客网时间：2024/05/02 19:50

原文地址： http://blog.sina.com.cn/s/blog_801997310101cthq.html 支持原创

1.刷新单个tableviewcell

NSIndexPath * indexPat=[NSIndexPath indexPathForRow:indexPlay inSection:0];

NSArray * indexArray=[NSArray arrayWithObject:indexPat];

[self.tableView reloadRowsAtIndexPaths:indexArray withRowAnimation:UITableViewRowAnimationAutomatic];

2. 判断该方法是否执行？？

BOOL isss= [cell.queuePlayer respondsToSelector:@selector(play)];

instancesRespondToSelector是指类的实例们是否能响应某一个方法（类操作），respondsToSelector是指类是否能响应某一方法（对象）

3.代码块的使用

int (^oneFrom)(int) = ^(int anInt) {

return anInt -1;

};

NSLog(@"%d",oneFrom(10));

4. 改变buuton的高亮

UIImageView * iv = [[UIImageView alloc] initWithFrame:CGRectMake(250, 5, 50, 34)];

iv.userInteractionEnabled = YES;

UIButton * navBtn = [UIButton buttonWithType:UIButtonTypeCustom];

navBtn.frame = CGRectMake(0, 0, 50, 34);

[navBtn setImage:[UIImage imageNamed:@"rong_Tian"] forState:UIControlStateNormal];

[navBtn setHighlighted:YES];

[navBtn addTarget:self action:@selector(btnPressed:) forControlEvents:UIControlEventTouchUpInside];

[navBtn setShowsTouchWhenHighlighted:YES];

[iv addSubview:navBtn];

[self.navigationController.navigationBar addSubview:iv];

5. 默认为cell第一行

NSIndexPath *first=[NSIndexPath indexPathForRow:0 inSection:0];

[self.tableView selectRowAtIndexPath:first animated:YES scrollPosition:UITableViewScrollPositionBottom];

6.一个项目中 ARC和非ARC 的混合使用

点击项目--》TARGETS-》Build Phases -》Compile Sources 中选择要改的.m 双击在标签中写：

1.如果是ARC项目，要加入非ARC的代码文件 fobjc-arc

2.如果是非ARC，要加入ARC的代码 -fno-objc-arc Enter就OK

// NSURL * url=[NSURL URLWithString:str];

// NSURLRequest *requestt = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];

// NSData *received = [NSURLConnection sendSynchronousRequest:requestt returningResponse:nil error:nil];

// NSString *strr = [[NSString alloc]initWithData:received encoding:NSUTF8StringEncoding];

// NSLog(@"这是成功返回的信息 %@",strr);

7.距离感应器

UIDeviceOrientation orientation3= [[UIDevice currentDevice] orientation];

NSLog(@"获取当前状态 %d",orientation3);

[[UIDevice currentDevice] setProximityMonitoringEnabled:YES];

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector(sensorStateChange:)

name:@"UIDeviceProximityStateDidChangeNotification"

object:nil];

-(void)sensorStateChange:(NSNotificationCenter *)notification;

{

if ([[UIDevice currentDevice] proximityState] == YES) {

NSLog(@"Device is close to user");

//在此写接近时，要做的操作逻辑代码

}else{

NSLog(@"Device is not close to user");

}

8.获得cookie

NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];

for (NSHTTPCookie *cookie in [cookieJar cookies]) {

NSLog(@"cookie＝＝＝＝＝ %@", cookie);

}

9.从相册中只获得视频文件

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary] == YES)

{

UIImagePickerController *videoLibraryController = [[[UIImagePickerController alloc] init] autorelease];

videoLibraryController.delegate = self;

videoLibraryController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

videoLibraryController.mediaTypes = [NSArray arrayWithObject:(NSString *)kUTTypeMovie];

[videoLibraryController setAllowsEditing:YES];

[self.navigationController presentViewController:videoLibraryController animated:YES completion:^{

}];

}

else

{

[self AlertlogError:@"暂时你还没有视频"];

}

10. 读取全局的Delegate：
KiloNetAppDelegate *appdelegate = (KiloNetAppDelegate *)[[UIApplication sharedApplication] delegate];

11.键盘透明

textField.keyboardAppearance = UIKeyboardAppearanceAlert;

12.URL错误：

Error Domain=ASIHTTPRequestErrorDomain Code=5 "Unable to create request (bad url?)" UserInfo=0x69ba0f0 {NSLocalizedDescription=Unable to create request (bad url?)}

解决办法：

NSString*url =@"http://oerp.xixingsoft.com:8083/oadata/MobileConfig.nsf/GetStandList?openagent&ViewNumber=新闻中心";

url=[url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

NSStringEncodingenc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);//gbk code-->utf8 code

NSData*data = [url dataUsingEncoding:NSUTF8StringEncoding];//[request responseData];

NSString*utf8str = [[[NSStringalloc] initWithData:data encoding:enc] autorelease];

13.请求中加cookie、 heard

当你需要添加更多的请求信息时，如，添加个请求Header：
[request addRequestHeader:@"name" value:@"Jory lee"];

14 Plist文件的保存修改除非在decument是可读可写的（在工程中可读不可写）

//获取路径对象

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

//获取完整路径

NSString *documentsDirectory = [paths objectAtIndex:0];

NSString *plistPath = [documentsDirectory stringByAppendingPathComponent:@"test.plist"];

NSLog(@"plist 地质 %@",plistPath);

NSMutableDictionary *dictplist = [[NSMutableDictionary alloc ] init];

[dictplist setObject:self.strWeb_id forKey:@"web_id"];

[dictplist writeToFile:plistPath atomically:YES];

15.获取文件夹的大小

-(long long) fileSizeAtPath:(NSString*) filePath{

NSFileManager* manager = [NSFileManager defaultManager];

if ([manager fileExistsAtPath:filePath]){

return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];

}

return 0;

}

16.改变tablevlewcell点击的颜色

cell.selectedBackgroundView = [[[UIView alloc] initWithFrame:cell.frame] autorelease];

cell.selectedBackgroundView.backgroundColor = [UIColor colorWithRed:54/255.0f green:110/255.0f blue:100/255.0f alpha:1.0f];

字

cell.textLabel.highlightedTextColor = [UIColor xxxcolor]; [cell.textLabel setTextColor:color

点击后，过段时间cell自动取消选中

[self performSelector:@selector(deselect) withObject:nil afterDelay:0.5f];

- (void)deselect

{

[self.tableVieww deselectRowAtIndexPath:[self.tableVieww indexPathForSelectedRow] animated:YES];

}

17.改变UITableViewStyleGrouped背景颜色

self.tableVieww.backgroundColor =[UIColor colorWithPatternImage:[UIImage imageNamed:@"更多背景图.png"]];

self.tableVieww.backgroundView =nil;

18.视图反转

//水平 queuePlayer.transform = CGAffineTransformScale(queuePlayer.transform, 1.0, -1.0);//垂直 queuePlayer.transform = CGAffineTransformScale(queuePlayer.transform, -1.0, 1.0); 19.改变icon的阴影圆圈，取消图标上的高光

1.进入plist文件 2.在Supported interface orientations 添加 Icon already includes gloss effects 设置为YES 也就是用自己的icon，不用系统的了

20.动态UIlable后添加图片

self.userNameLabel=[[[UILabel alloc]initWithFrame:CGRectMake(60, 7, 220, 20)]autorelease];

self.userNameLabel.textColor= [UIColor blackColor];

self.userNameLabel.text=self.strNamee;

self.userNameLabel.backgroundColor=[UIColor clearColor];

self.userNameLabel.numberOfLines=0;

UIFont *font = [UIFont fontWithName:@"Helvetica-Bold" size:17.0f];

[self.userNameLabel setFont:font];

[self.contentView addSubview:self.userNameLabel];

CGSize size = [self.strNamee sizeWithFont:font constrainedToSize:CGSizeMake(277, 20.0f)];

NSLog(@"kuang %f ",size.width);

CGRect rect=self.userNameLabel.frame;

rect.size=size;

NSLog(@"321 %f %f",rect.size.width,rect.size.height);

[self.userNameLabel setFrame:rect];

//判断男女

UIImageView * imaSex=[[UIImageView alloc]initWithFrame:CGRectMake(self.userNameLabel.frame.size.width+65, 10, 12, 13)];

21.向自定义的cell中传值，最好用方法在tableview中来调用如果有参数直接来传

22.精确时间差

//时间差

- (NSString *)intervalSinceNow: (NSString *) theDate

{

NSDateFormatter *date=[[NSDateFormatter alloc] init];

[date setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate *d=[date dateFromString:theDate];

NSTimeInterval late=[d timeIntervalSince1970]*1;

NSDate* dat = [NSDate dateWithTimeIntervalSinceNow:0];

NSTimeInterval now=[dat timeIntervalSince1970]*1;

NSString *timeString=@"";

NSTimeInterval cha=now-late;

if (cha/3600<1) {

timeString = [NSString stringWithFormat:@"%f", cha/60];

timeString = [timeString substringToIndex:timeString.length-7];

timeString=[NSString stringWithFormat:@"%@分钟前", timeString];

}

if (cha/3600>1&&cha/86400<1) {

timeString = [NSString stringWithFormat:@"%f", cha/3600];

timeString = [timeString substringToIndex:timeString.length-7];

timeString=[NSString stringWithFormat:@"%@小时前", timeString];

}

if (cha/86400>1)

{

timeString = [NSString stringWithFormat:@"%f", cha/86400];

timeString = [timeString substringToIndex:timeString.length-7];

timeString=[NSString stringWithFormat:@"%@天前", timeString];

}

[date release];

return timeString;

}

22.按钮在cell上单击第几行

在cell.contentView上：

//获得row

NSInteger row = [[self.tableView indexPathForCell:(UITableViewCell *)[[sender superview] superview]] row];

//获得section

NSInteger row = [[self.tableView indexPathForCell:(UITableViewCell *)[[sender superview] superview]] section];

//获得indexPath

NSIndexPath *indexPath = [self.tableView indexPathForCell:(UITableViewCell *)[[sender superview] superview]];

直接添加到cell上：

//获得row

NSInteger row = [[self.tableView indexPathForCell:(UITableViewCell *)[sender superview]] row];

//获得section

NSInteger section = [[self.tableView indexPathForCell:(UITableViewCell *)[sender superview]] section];

//获得indexPath

NSIndexPath *indexPath = [self.tableView indexPathForCell:(UITableViewCell *)[sender superview]];

23:判断Home键在哪个方法要执行对应的方法

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(rongTianOrientation:) name:@"UIDeviceOrientationDidChangeNotification" object:nil];

- (void) deviceOrientationDidChangeAction:(NSNotification *)note

{

NSInteger currentOrientation = [[note object] orientation];

switch (currentOrientation) {

case0: { //未知方向

break;

}

case1: { //home键向下

break;

}

case2: { //home键向上

break;

}

case3: { //home键向左

break;

}

case4: { //home键向右

break;

}

default:

break;

}

24.模拟器不能运行的错误

dyld: Library not loaded: @rpath/SenTestingKit.framework/Versi*****/A/SenTestingKit
Referenced from: /Users/⋯⋯/Application Support/iPhone Simulator/5.0/Applicati*****/F179924C-0EB7-4CCA-88D6-3BA1F68F122D/ILUTU.app/ILUTU
Reason: image not found

iOS <wbr>第6项目个别技术点

把SentestingKit。 frameWork 有原来的required改为Optional 就ok

25.还原状态栏

显示原来的状态栏

（1）

[[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:YES];

[[UIApplication sharedApplication].keyWindow setFrame:CGRectMake(0, 20, 320, [UIScreen mainScreen].applicationFrame.size.height)];

//重新设定标题栏显示的位置

[self.navigationController.navigationBar setFrame:CGRectMake(0, 0, 320, 44)];

（2）

在别的页面[[UIApplication sharedApplication].keyWindow setFrame:CGRectMake(0, 0, 320, [UIScreenmainScreen].applicationFrame.size.height)];

26.获得相册视频的总时间

- (int)getVideopTime:(NSURL * )videourl

{

NSDictionary *opts = [NSDictionary dictionaryWithObject:[NSNumbernumberWithBool:NO]

forKey:AVURLAssetPreferPreciseDurationAndTimingKey];

AVURLAsset *urlAsset = [AVURLAsset URLAssetWithURL:videourl options:opts]; // 初始化视频媒体文件

int minute = 0, second = 0;

second = urlAsset.duration.value / urlAsset.duration.timescale; // 获取视频总时长,单位秒

NSLog(@"movie duration : %d", second);

if (second >= 60) {

int index = second / 60;

minute = index;

second = second - index*60;

}

return second;

}

27.视频播放器循环播放大小……

(1) MPMoviePlayerController

MPMoviePlayerController *player;

NSURL *url =[NSURL URLWithString:fileName];

player = [[MPMoviePlayerController alloc] init];

player.view.frame = CGRectMake(10, 30, 300 , 225);

player.contentURL = url;

player.repeatMode = MPMovieRepeatModeOne;

player.controlStyle = MPMovieControlStyleEmbedded;

player.scalingMode = MPMovieScalingModeAspectFill; //充满屏幕

[self.view addSubview:player.view];

[player play];

(2).avplayer

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playerItemDidReachEnd:) name:AVPlayerItemDidPlayToEndTimeNotification

object:plaitem];

}

}];

#pragma mark - Notification Callbacks

- (void)playerItemDidReachEnd:(NSNotification *)notification {

NSLog(@"是跳转第一侦吗？ ");

[self.queuePlayer seekToTime:kCMTimeZero];

[self.queuePlayer play];

}

28.sina微博错误返回值格式

http://open.weibo.com/wiki/Error_code

29.ios 获得文件夹的大小

//计算文件夹下文件的总大小

-(long)fileSizeForDir:(NSString*)path

{

NSFileManager *fileManager = [[NSFileManager alloc] init];

long size = 0;

NSArray* array = [fileManager contentsOfDirectoryAtPath:path error:nil];

for(int i = 0; i<[array count]; i++)

{

NSString *fullPath = [path stringByAppendingPathComponent:[array objectAtIndex:i]];

BOOL isDir;

if ( !([fileManager fileExistsAtPath:fullPath isDirectory:&isDir] && isDir) )

{

NSDictionary *fileAttributeDic=[fileManager attributesOfItemAtPath:fullPath error:nil];

size+= fileAttributeDic.fileSize;

} else {

[self fileSizeForDir:fullPath];

}

[fileManager release]; return size; }

30. iOS 谓词过滤 (ios 谓词)

//搜索用谓词过滤数组

NSArray * arrMy=@[@"张2荣三a",@"李四b",@"王五a",@"李流j",@"荣天321",@"iOS基地",@"iOS7"];

NSString * strg=@"荣";

NSPredicate * fiecate=[NSPredicate predicateWithFormat:@"SELF CONTAINS %@",strg];

NSArray * arr3=[arrMy filteredArrayUsingPredicate:fiecate];

NSLog(@"这是我过滤的数组对吗？%@",arr3);

31.多线程的多种创建

// NSThread * th=[[NSThread alloc]initWithTarget:self selector:@selector(thAction) object:nil];

// [th start];

//[NSThread detachNewThreadSelector:@selector(thAction) toTarget:self withObject:nil];

// [self performSelectorInBackground:@selector(thAction) withObject:self];

// NSOperationQueue * operationQueue=[[NSOperationQueue alloc]init];

// [operationQueue addOperationWithBlock:^{

// for(int i=0; i<20;i++){

// NSLog(@"This isThread: %d",i);

// }

// }];

// NSOperationQueue * operationQueue=[[NSOperationQueue alloc]init];

// //设置线程池中的并发数

// operationQueue.maxConcurrentOperationCount=1;

// NSInvocationOperation * invocation1=[[NSInvocationOperation alloc]initWithTarget:self selector:@selector(threadOne) object:nil];

// [invocation1 setQueuePriority:NSOperationQueuePriorityLow];

// NSInvocationOperation * invocation2=[[NSInvocationOperation alloc]initWithTarget:self selector:@selector(threadTwo) object:nil];

// [invocation2 setQueuePriority:NSOperationQueuePriorityHigh];

// [operationQueue addOperation:invocation1];

// [operationQueue addOperation:invocation2];

32.用多线程开启Nstimer提高精确度

//用多线程开启nstimer提高精确度

- (void)mutiThread

{

NSLog(@"Start NStimer");

@autoreleasepool {

[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timerAction:) userInfo:nilrepeats:YES];

}

//获得当前的runloop，线程就停在这里

[[NSRunLoop currentRunLoop]run];

NSLog(@"after");

}

- (void)timerAction:(NSTimer * )timer

{

i++;

NSLog(@"Print NSTimer");

if (i==5) {

[timer invalidate];

}

33.判断此页面是push，还是模态过来的

if (self.presentingViewController) {

NSLog(@"这个是模态过来的！");}

34。等比例放大缩小视图

UILabel * la=(UILabel * )[self.view viewWithTag:908];

[UIView animateWithDuration:.5 animations:^{

CGAffineTransform transform=la.transform;

transform=CGAffineTransformScale(la.transform, 1.5, 1.5);

la.transform=transform;

} completion:^(BOOL finished) {

CGAffineTransform transform=la.transform;

transform=CGAffineTransformScale(la.transform, 0.5, 0.5);

la.transform=transform;

}];

35.清掉编译文件

~/Library/Developer/Xcode/DerivedData

模拟器清空编译

~/Library/Application Support/iPhone Simulator/

36.改变状态栏的颜色状态

[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleDefault];

[[UIApplication sharedApplication] setStatusBarHidden:NO];

37.给自己的项目中添加特殊的标示符号

http://patorjk.com/software/taag/#p=moreopts&h=0&v=1&f=优雅&t=V

38 清空某个文件夹

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

NSString *outputURL = paths[0];

[NSFileManager.new removeItemAtPath:outputURL error:nil];

[NSFileManager.new createDirectoryAtPath:outputURL

withIntermediateDirectories:YES

attributes:nil

error:NULL];

39. 在document下创建文件

NSString *writePath=[NSString stringWithFormat:@"%@/%@.txt",stre,@"aaa"];

NSData *data = [@"" dataUsingEncoding:NSUTF8StringEncoding];//新文件的初始数据，设为空

[[NSFileManager defaultManager] createFileAtPath:writePath contents:data attributes:nil];//创建文件的命令在这里

40.layoutSubviews在以下情况下会被调用：

1、init初始化不会触发layoutSubviews

2、addSubview会触发layoutSubviews
3、设置view的Frame会触发layoutSubviews，当然前提是frame的值设置前后发生了变化
4、滚动一个UIScrollView会触发layoutSubviews
5、旋转Screen会触发父UIView上的layoutSubviews事件
6、改变一个UIView大小的时候也会触发父UIView上的layoutSubviews事件

41.苹果审核加急通道

https://developer.apple.com/appstore/contact/?topic=expedite

51 .美化配置git log

$ git config --global alias.lg "log --color --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)

52. Default.png  添加动画

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

// Override point for customization after application launch.

self.window.backgroundColor = [UIColor whiteColor];

RootViewController *rooViewController = [[RootViewController alloc]init];

RTNavigationController *navgationVC = [[RTNavigationController alloc]initWithRootViewController:rooViewController];

self.window.rootViewController = navgationVC;

UIImageView *splashView = [[UIImageView alloc] initWithFrame:CGRectMake(0,0, 320, 568)];

splashView.image = [UIImage imageNamed:@"Default.png"];

[self.window addSubview:splashView];

[self.window bringSubviewToFront:splashView];

[UIView beginAnimations:nil context:nil];

[UIView setAnimationDuration:2.0];

[UIView setAnimationTransition:UIViewAnimationTransitionNone forView: self.window cache:YES];

[UIView setAnimationDelegate:self];

[UIView setAnimationDidStopSelector:@selector(startupAnimationDone:finished:context:)];

splashView.alpha = 0.0;

splashView.frame = CGRectMake(-60, -85, 440, 635);

[UIView commitAnimations];

[self.window makeKeyAndVisible];

return YES;

53.调用系统 电话， 特定的页面


1、调用 电话phone[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://4008008288"]];
2、调用自带 浏览器 safari[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://www.zhece.com"]];
3、调用 自带mail[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"mailto://admin@abt.com"]];
4、调用 SMS[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"sms://800888"]];
5，跳转到系统设置相关界面
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=WIFI"]];

其中，发短信，发Email的功能只能填写要发送的地址或号码，无法初始化发送内容，如果想实现内容的话，还需要更复杂一些，实现其各自的委托方法。
若需要传递内容可以做如下操作：加入：MessageUI.framework #import  实现代理：MFMessageComposeViewControllerDelegate

[java] view plaincopy
调用sendSMS函数  
//内容，收件人列表  
- (void)sendSMS:(NSString *)bodyOfMessage recipientList:(NSArray *)recipients  
{  
   
    MFMessageComposeViewController *controller = [[[MFMessageComposeViewController alloc] init] autorelease];  
   
    if([MFMessageComposeViewController canSendText])  
   
    {  
   
        controller.body = bodyOfMessage;     
   
        controller.recipients = recipients;  
   
        controller.messageComposeDelegate = self;  
   
        [self presentModalViewController:controller animated:YES];  
   
    }     
   
}  
   
// 处理发送完的响应结果  
- (void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result  
{  
  [self dismissModalViewControllerAnimated:YES];  
   
  if (result == MessageComposeResultCancelled)  
    NSLog(@"Message cancelled")  
  else if (result == MessageComposeResultSent)  
    NSLog(@"Message sent")    
  else   
    NSLog(@"Message failed")    
}  
   
   
发送邮件的为：  
导入#import   
实现代理：MFMailComposeViewControllerDelegate  
   
//发送邮件  
-(void)sendMail:(NSString *)subject content:(NSString *)content{  
   
    MFMailComposeViewController *controller = [[[MFMailComposeViewController alloc] init] autorelease];  
   
    if([MFMailComposeViewController canSendMail])  
   
    {  
   
        [controller setSubject:subject];  
   
        [controller setMessageBody:content isHTML:NO];  
   
        controller.mailComposeDelegate = self;  
   
        [self presentModalViewController:controller animated:YES];  
   
    }      
}  
   
//邮件完成处理  
-(void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error{  
   
    [self dismissModalViewControllerAnimated:YES];  
   
    if (result == MessageComposeResultCancelled)  
        NSLog(@"Message cancelled");  
    else if (result == MessageComposeResultSent)  
        NSLog(@"Message sent");   
    else   
        NSLog(@"Message failed");    
   
}  
   
默认发送短信的界面为英文的，解决办法为：在.xib 中的Localization添加一組chinese

54.程序中获取软件的版本号和app名称 
[java] view plaincopy
应用程序的名称和版本号等信息都保存在mainBundle的infoDictionary字典中，用下面代码可以取出来。  
NSDictionary* infoDict =[[NSBundle mainBundle] infoDictionary];  
NSString* versionNum =[infoDict objectForKey:@"CFBundleVersion"];//版本名称  
NSString*appName =[infoDict objectForKey:@"CFBundleDisplayName"];//app名称  
NSString*text =[NSString stringWithFormat:@"%@ %@",appName,versionNum]; 
   55.如何使屏幕一直保持唤醒状态？（就是不自动黑屏） [一下几条技术点 转自：路不平 博客]
比如，如果我们做一个播放视频的功能时，想在播放的时候，不会自动进入屏保（黑屏）
只要在代码里加入这一行：
 
[java] view plaincopy
[[UIApplication sharedApplication] setIdleTimerDisabled:YES];  

当然，在想要黑屏的时候还需要把它设置为NO（比如视频播放完毕时），不然屏幕会在此软件运行下一直亮着。
56。如何设置视图（view）在最上层？或是view1和view2交换？
self.view exchangeSubviewAtIndex:withSubviewAtIndex:];
57.返回特定的pop viewController界面
    NSArray *viewControllers = [self.navigationController viewControllers];
    UIViewController *viewControll = [viewControllers objectAtIndex:2];
      [self.navigationController pushViewController:viewControll animated:YES];
58,图片模糊化处理
 

[cpp] view plaincopy
+(UIImage *)scale:(UIImage *)image toSize:(CGSize)size  
{  
    UIGraphicsBeginImageContext(size);  
    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];  
    UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();  
    UIGraphicsEndImageContext();  
    return scaledImage;  
}  

59.GCD的一些基本使用
// 后台执行： dispatch_async(dispatch_get_global_queue(0,0),^{ // something }); // 主线程执行： dispatch_async(dispatch_get_main_queue(),^{ // something }); // 一次性执行： staticdispatch_once_t onceToken; dispatch_once(&onceToken,^{ // code to be executed once }); // 延迟2秒执行： doubledelayInSeconds = 2.0; dispatch_time_tpopTime = dispatch_time(DISPATCH_TIME_NOW,delayInSeconds* NSEC_PER_SEC); dispatch_after(popTime,dispatch_get_main_queue(),^(void){ // code to be executed on the main queue after delay });

60. GCD 并发执行，等多个线程执行完成， 再执行总线程
   dispatch_group_t grounp = dispatch_group_create();
    dispatch_group_async(grounp, dispatch_get_global_queue(0, 0), ^{
        NSLog(@" zhece.com >>>>>>>>>>>  1 ");
    });
   dispatch_group_async(grounp, dispatch_get_global_queue(0, 0), ^{
        NSLog(@" zhece.com >>>>>>>>>>>  2 ");
    });
  dispatch_group_notify(grounp, dispatch_get_global_queue(0, 0), ^{
        NSLog(@" zhece.com >>>>>>>>>>>  多线程完成,总执行 ");
    });
61.让程序在后台长久运行
使用block的另一个用处是可以让程序在后台较长久的运行。在以前，当app被按home键退出后，app仅有最多5秒钟的时候做一些保存或清理资源的工作。但是应用可以调用UIApplication的beginBackgroundTaskWithExpirationHandler方法，让app最多有10分钟的时间在后台长久运行。这个时间可以用来做清理本地缓存，发送统计数据等工作
// AppDelegate.h文件
@property(assign,nonatomic)UIBackgroundTaskIdentifierbackgroundUpdateTask; // AppDelegate.m文件 -(void)applicationDidEnterBackground:(UIApplication*)application { [selfbeingBackgroundUpdateTask]; // 在这里加上你需要长久运行的代码 [selfendBackgroundUpdateTask]; } -(void)beingBackgroundUpdateTask { self.backgroundUpdateTask=[[UIApplicationsharedApplication]beginBackgroundTaskWithExpirationHandler:^{ [selfendBackgroundUpdateTask]; }]; } -(void)endBackgroundUpdateTask { [[UIApplicationsharedApplication]endBackgroundTask:self.backgroundUpdateTask]; self.backgroundUpdateTask=UIBackgroundTaskInvalid; }

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