I haven't published any articles for a long time. I want to organize the iOS development knowledge!

2. What is the memory management mechanism?

Cocoa provides a mechanism to implement the logic model mentioned above. It is called "referring counting" or "retain counting ):

3. What are the meanings and usage of minus signs and plus signs in objc?

① Subtraction indicates the start of a function, method, or message (called and implemented on an instance of a class) (it can be considered as a private method)

② The plus sign indicates that other functions can directly call methods in this class, instead of creating instances of this class (commonly known as static methods)

4. project arrangement

Button:

Btnwinwin = [uibutton buttonwithtype: uicontrolstatenormal];

Btnwinwin. Frame = cgrectmake (768,679,256, 42 );

[Btnwinwin setbackgroundimage: [uiimage imagenamed: @ "btnwinwin.jpg"] forstate: uicontrolstatenormal];

[Btnwinwin addtarget: Self action: @ selector (winwin) forcontrolevents: uicontroleventtouchupinside];

[Self. View addsubview: btnwinwin];

 

PLAYER:

Nsstring * soundpath = [[nsbundle mainbundle] pathforresource: musictop oftype: @ "MP3"];

Nsurl * soundurl = [[nsurl alloc] initfileurlwithpath: soundpath];

Player = [[avaudioplayer alloc] initwithcontentsofurl: soundurl error: Nil];

[PLAYER setdelegate: Self];

[Player play];

Animation conversion between two controllers:

Mainframe = [[test_book1_2_classes_viewcontrolleralloc] init];

Havemainfram = true;

Catransition * transition = [catransitionanimation];

Transition. Duration = 1.0f;/* interval */

Transition. timingfunction = [camediatimingfunctionfunctionwithname: kcamediatimingfunctioneaseineaseout];/* speed of animation start and end */

Transition. type = @ "pagecurl ";

Transition. Subtype = kcatransitionfromtop;/* animation direction */

Transition. Delegate = self;

[Self. navigationcontroller. View. layeraddanimation: Transition forkey: Nil];

[Self. navigationcontrollerpushviewcontroller: mainframeanimated: Yes];

 

SDK related:

1, the merger of two. A static library, static library has points suitable for the simulator and the real machine, how to merge please see: My another article http://www.cnblogs.com/visen-0/archive/2011/08/02/2125067.html

2. Create a root permission application: http://www.cnblogs.com/visen-0/archive/2011/08/22/2149014.html

3. Get the list of installed: http://www.cnblogs.com/visen-0/archive/2011/08/22/2148847.html

4. download and install the self-made. IPA file.

5. To determine whether to jailbreak, go to [nsfilemanager defamanager manager] to find out if there is a corresponding cydia. app program.

 

Submit information to the server:

// Device information

Uidevice * Device = [uidevice currentdevice];

Nsstring * identifier = [[nsstringstringwithstring: [device uniqueidentifier] lowercasestring];

Nslog (@ "% @", identifier );

Nsstring * requeststring = [nsstringstringwithformat: @ "http://www.yrwang.net/post.aspx? Client = IOS & DeviceID =%@ & reportmessage =%@ ", identifier, opinion. Text];

 

Nsstring * requeststringutf8 = [requeststring stringbyaddingpercentescapesusingencoding: nsutf8stringencoding];

 

Nsurl * myurl = [[nsurl alloc] initwithstring: requeststringutf8];

Nsmutableurlrequest * myrequest = [nsmutableurlrequestrequestwithurl: myurl

Cachepolicy: nsurlrequestreloadignoringlocalandremotecachedata

Timeoutinterval: 30];

[Myurl release];

 

Connection _ = [[nsurlconnectionalloc] initwithrequest: myrequest delegate: Self];

Parse XML:

Nsxmlparser * xmlread = [[nsxmlparser alloc] initwithdata: Data]; // initialize the nsxmlparser object

[Data release];

[Xmlread setdelegate: Self];

[Xmlread parse];

Listener mode:

[[Nsnotificationcenterdefacenter] addobserver: Self

Selector: @ selector (getupdatedpoints :)

Name: 111

Object: Nil];

[[Nsnotifcencenterdefacenter] postnotificationname: 111 object: Nil];

Singleton mode:

Static adpublisherconnect * sharedinstance _ = nil;

+ (Adpublisherconnect *) sharedadpublisherconnect

{

If (! Sharedinstance _)

{

Sharedinstance _ = [[superalloc] init];

}

 

Returnsharedinstance _;

}

File Read and Write, create:
This is an example of creation:

// Create a file manager

Nsfilemanager * filemanager = [nsfilemanagerdefaultmanager];

// Obtain the path

// Obtain the path of the nsdocumentdirectory Parameter

Nsarray * paths = nssearchpathfordirectoriesindomains (nsdocumentdirectory, nsuserdomainmask, yes );

Nsstring * documentsdirectory = [paths objectatindex: 0]; // The path required for the path.

// Change to the directory to be operated

[Filemanager changecurrentdirectorypath: [documentsdirectory stringbyexpandingtildeinpath];

// Create the file filename file name and the content of the contents file. If there is no content at the beginning, you can set it to nil, the attribute of the attributes file, initially Nil

// Obtain the file path

Nsstring * Path = [documentsdirectory stringbyappendingpathcomponent: Filename];

 

// Create a data buffer

Nsmutabledata * Writer = [[nsmutabledataalloc] init];

// Add the string to the buffer

[Writer appenddata: [contents datausingencoding: nsutf8stringencoding];

// Add other data to the buffer

// Write the buffered data to the file

[Writer writetofile: path atomically: Yes];

[Writer release];

 

To obtain a string: nsange

E = [tempstring rangeofstring: @ ","];

Key = [tempstring substringtoindex: E. Location];

 

E = [tempstring rangeofstring: @ "\ r \ n"];

Tempstring = [tempstring substringfromindex: E. Location + 1];

 

Recording:

Avaudiosession

Paging:
Uitable Paging

Find the file directory;

+ (Nsmutablearray *) findfile {

Nsfilemanager * filemanager = [[nsfilemanager defaultmanager] init];

Nsmutablearray * everytitle = [[nsmutablearray alloc] init];

Nsarray * filepaths = nssearchpathfordirectoriesindomains (nslibrarydirectory, nsuserdomainmask, yes );

Nsstring * filepath = [filepaths objectatindex: 0];

 

Nslog (@ "% @", filepath );

Nsdirectoryenumerator * direnum = [filemanager enumeratoratpath: filepath];

Nsstring * filename;

While (filename = [direnum nextobject]) {

[Everytitle addobject: Filename];

}

 

Return everytitle;

}

 

Form:

Uiactionsheet

 

Long press button:

Uilongpressgesturerecognizer

 

Scroll View:

Uiscrollview

 

Web page:

Uiwebview

 

Hide the navigation bar and apply full screen.