iOS7:那些容易被忽视的新特性

1. NSString*identifierForVendor=[[UIDevicecurrentDevice].identifierForVendorUUIDString];
2. NSString*identifierForAdvertising=[[ASIdentifierManagersharedManager].advertisingIdentifierUUIDString];

1. //第一次调用这个方法的时候，系统会提示用户让他同意你的app获取麦克风的数据
2. //其他时候调用方法的时候，则不会提醒用户
3. //而会传递之前的值来要求用户同意
4. [[AVAudioSessionsharedInstance]requestRecordPermission:^(BOOLgranted){
5. if(granted){
6. //用户同意获取数据
7. }else{
8. //可以显示一个提示框告诉用户这个app没有得到允许？
9. }
10. }];

1. NSArray*arr=@[];
2. iditem=[arrfirstObject];
3. //之前你需要做以下工作
4. iditem=[arrcount]>0?arr[0]:nil;

1. UIImageRenderingModeAutomatic//根据图片的使用环境和所处的绘图上下文自动调整渲染模式。
2. UIImageRenderingModeAlwaysOriginal//始终绘制图片原始状态，不使用TintColor。
3. UIImageRenderingModeAlwaysTemplate//始终根据TintColor绘制图片，忽略图片的颜色信息。

1. UIImage*img=[UIImageimageNamed:@"myimage"];
2. img=[imgimageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];

1. UINavigationBar*bar=self.navigationController.navigationBar;
2. UIColor*color=[UIColorgreenColor];
3. if([barrespondsToSelector:@selector(setBarTintColor:)]){//iOS7+
4. bar.barTintColor=color;
5. }else{//whatyearisthis?2012?
6. bar.tintColor=color;
7. }

1. +(UIColor*)viewFlipsideBackgroundColor;
2. +(UIColor*)scrollViewTexturedBackgroundColor;
3. +(UIColor*)underPageBackgroundColor;

1. @property(nonatomic,readonly)BOOLwirelessRoutesAvailable;//是否有设备可以连接的无线线路？
2. @property(nonatomic,readonly)BOOLwirelessRouteActive;//设备现在是否连接上了网络
3. NSString*constMPVolumeViewWirelessRoutesAvailableDidChangeNotification;
4. NSString*constMPVolumeViewWirelessRouteActiveDidChangeNotification;

1. @importCoreTelephony.CTTelephonyNetworkInfo;//newmodulessyntax!
2. @interfaceAppDelegate()
3. //weneedtokeepareferencetotheCTTelephonyNetworkInfoobject,otherwisethenotificationswon'tbefired!
4. @property(nonatomic,strong)CTTelephonyNetworkInfo*networkInfo;
5. @end
7. @implementationViewController
9. -(BOOL)application:(UIApplication*)applicationdidFinishLaunchingWithOptions:(NSDictionary*)launchOptions{
10. //whateverstuffyourmethoddoes...
12. self.networkInfo=[[CTTelephonyNetworkInfoalloc]init];
13. NSLog(@"Initialcellconnection:%@",self.networkInfo.currentRadioAccessTechnology);
14. [[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(radioAccessChanged)name:
15. CTRadioAccessTechnologyDidChangeNotificationobject:nil];
17. //whateverstuffyourmethoddoes...
18. }
20. -(void)radioAccessChanged{
21. NSLog(@"Nowyou'reconnectedvia%@",self.networkInfo.currentRadioAccessTechnology);
22. }
24. @end

1. #import
3. -(BOOL)saveCredentials:(NSError**)error{
4. SSKeychainQuery*query=[[SSKeychainQueryalloc]init];
5. query.password=@"MySecretPassword";
6. query.service=@"MyAwesomeService";
7. query.account=@"JohnDoe";
8. query.synchronizable=YES;
9. return[querysave:&error];
10. }
12. -(NSString*)savedPassword:(NSError**)error{
13. SSKeychainQuery*query=[[SSKeychainQueryalloc]init];
14. query.service=@"MyAwesomeService";
15. query.account=@"JohnDoe";
16. query.synchronizable=YES;
17. query.password=nil;
18. if([queryfetch:&error]){
19. returnquery.password;
20. }
21. returnnil;
22. }

1. NSString*html=@"Wow!NowiOScancreate

   NSAttributedString

   fromHTMLs!";
2. NSDictionary*options=@{NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType};
4. NSAttributedString*attrString=[[NSAttributedStringalloc]initWithData:[htmldataUsingEncoding:NSUTF8StringEncoding]
5. options:optionsdocumentAttributes:nilerror:nil];

1. #import
3. -(BOOL)saveCredentials:(NSError**)error{
4. SSKeychainQuery*query=[[SSKeychainQueryalloc]init];
5. query.password=@"MySecretPassword";
6. query.service=@"MyAwesomeService";
7. query.account=@"JohnDoe";
8. query.synchronizable=YES;
9. return[querysave:&error];
10. }
12. -(NSString*)savedPassword:(NSError**)error{
13. SSKeychainQuery*query=[[SSKeychainQueryalloc]init];
14. query.service=@"MyAwesomeService";
15. query.account=@"JohnDoe";
16. query.synchronizable=YES;
17. query.password=nil;
18. if([queryfetch:&error]){
19. returnquery.password;
20. }
21. returnnil;

1. NSAttributedString*attrString;//frompreviouscode
2. NSDictionary*options=@{NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType};
4. NSData*htmlData=[attrStringdataFromRange:NSMakeRange(0,[attrStringlength])documentAttributes:optionserror:nil];
5. NSString*htmlString=[[NSStringalloc]initWithData:htmlDataencoding:NSUTF8StringEncoding];

1. //FromNSData.h
4. -(id)initWithBase64EncodedString:(NSString*)base64Stringoptions:(NSDataBase64DecodingOptions)options;
7. -(NSString*)base64EncodedStringWithOptions:(NSDataBase64EncodingOptions)options;
10. -(id)initWithBase64EncodedData:(NSData*)base64Dataoptions:(NSDataBase64DecodingOptions)options;
13. -(NSData*)base64EncodedDataWithOptions:(NSDataBase64EncodingOptions)options;

1. NSData*sampleData=[@"Somesampledata"dataUsingEncoding:NSUTF8StringEncoding];
3. NSString*base64String=[sampleDatabase64EncodedStringWithOptions:0];
4. NSLog(@"Base64-encodedstringis%@",base64String);//prints"U29tZSBzYW1wbGUgZGF0YQ=="
6. NSData*dataFromString=[[NSDataalloc]initWithBase64EncodedString:base64Stringoptions:0];
7. NSLog(@"Stringis%@",[NSStringstringWithUTF8String:[dataFromStringbytes]]);//prints"StringisSomesampledata"

2. -(id)initWithBase64Encoding:(NSString*)base64String;
3. -(NSString*)base64Encoding;

1. AVSpeechSynthesizer*synthesizer=[[AVSpeechSynthesizeralloc]init];
2. AVSpeechUtterance*utterance=
3. [AVSpeechUtterancespeechUtteranceWithString:@"Wow,Ihavesuchanicevoice!"];
4. utterance.rate=AVSpeechUtteranceMaximumSpeechRate/4.0f;
5. utterance.voice=[AVSpeechSynthesisVoicevoiceWithLanguage:@"en-US"];//defaultstoyoursystemlanguage
6. [synthesizerspeakUtterance:utterance];

1. UIScreenEdgePanGestureRecognizer*recognizer=[[UIScreenEdgePanGestureRecognizeralloc]initWithTarget:selfaction:
2. @selector(handleScreenEdgeRecognizer:)];
3. recognizer.edges=UIRectEdgeLeft;//acceptgesturesthatstartfromtheleft;we'reprobablybuildinganotherhamburgermenu!
4. [self.viewaddGestureRecognizer:recognizer];

1. UIScrollViewKeyboardDismissModeNone//thekeyboardisnotdismissedautomaticallywhenscrolling
2. UIScrollViewKeyboardDismissModeOnDrag//dismissesthekeyboardwhenadragbegins
3. UIScrollViewKeyboardDismissModeInteractive//thekeyboardfollowsthedraggingtouchoffscreen,andmaybe
4. pulledupwardagaintocancelthedismiss

1. UIImage*image=[UIImageimageNamed:@"myImage"];
2. CIDetector*detector=[CIDetectordetectorOfType:CIDetectorTypeFace
3. context:nil
4. options:@{CIDetectorAccuracy:CIDetectorAccuracyHigh}];
6. NSDictionary*options=@{CIDetectorSmile:@YES,CIDetectorEyeBlink:@YES};
8. NSArray*features=[detectorfeaturesInImage:image.CIImageoptions:options];
10. for(CIFaceFeature*featureinfeatures){
11. NSLog(@"Bounds:%@",NSStringFromCGRect(feature.bounds));
13. if(feature.hasSmile){
14. NSLog(@"Nicesmile!");
15. }else{
16. NSLog(@"Whysoserious?");
17. }
18. if(feature.leftEyeClosed||feature.rightEyeClosed){
19. NSLog(@"Openyoureyes!");
20. }
21. }

1. NSMutableAttributedString*attributedString=[[NSMutableAttributedStringalloc]initWithString:@"Thisisanexampleby@marcelofabri_"];
2. [attributedStringaddAttribute:NSLinkAttributeName
3. value:@"username://marcelofabri_"
4. range:[[attributedStringstring]rangeOfString:@"@marcelofabri_"]];
7. NSDictionary*linkAttributes=@{NSForegroundColorAttributeName:[UIColorgreenColor],
8. NSUnderlineColorAttributeName:[UIColorlightGrayColor],
9. NSUnderlineStyleAttributeName:@(NSUnderlinePatternSolid)};
11. //assumethattextViewisaUITextViewpreviouslycreated(eitherbycodeorInterfaceBuilder)
12. textView.linkTextAttributes=linkAttributes;//customizestheappearanceoflinks
13. textView.attributedText=attributedString;
14. textView.delegate=self;

1. -(BOOL)textView:(UITextView*)textViewshouldInteractWithURL:(NSURL*)URLinRange:(NSRange)characterRange{
2. if([[URLscheme]isEqualToString:@"username"]){
3. NSString*username=[URLhost];
4. //dosomethingwiththisusername
5. //...
6. returnNO;
7. }
8. returnYES;//letthesystemopenthisURL
9. }

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