IOS

Define attributes in the appdelegate class For example, a textdb object assigns the value to this object in other classes to use this object in the appdelegate class. @ Class textdb; @ interface appdelegate: uiresponder {textdb * itextdb ;}

1. Restart (of course, this method usually does not work) 2. Check whether the certificate is correct 3. Set the value in project --> info --> deployment target --> IOS deployment target to Targets --> summary --> IOS application target --> set

/* =--= Add data to the sqlite3 database ===--= * // 1. define a sqlite3 pointer sqlite3 * dB; // 2. the return value int dbrc for receiving successful read/write database operations; // 3. const char * dbfilepathutf8 = [dbfilepath utf8string]; // 4.

We can see that the (I personally think it is uibutton) icon is in the shape of a rounded corner, which is implemented using calayer, First, calayer and uiview are ambiguous and mutually dependent: both inherit from the nsobject class. It should be

I will not talk about the push mechanism and the certificate used for pushing here. Code for pushing: Client: 1. Tell the application to receive push messages (of course, in the didfinishlaunchingwitexceptions method) [application

1. Import the third-party class library ASIHTTPRequest : Complete ASIHttpRequest class library code download: Download 2. In the. h file #import #import "ASIHTTPRequest.h"#import "ASINetworkQueue.h"@interface DownLoadViewController :

Json data: {"Result": [{"meeting": {"addr": "203", "creator": "Zhang Yi", "member": [{"name ": "Zhang 'er", "age": "20" },{ "name": "Zhang San", "age": "21" },{ "name": "Zhang Si ", "age": "22"}] }}, {"meeting": {"addr": "204", "creator": "Zhang

Logic: First create an nsurl address, send a request, and then call -(Void) connection :( nsurlconnection *) connection didreceivedata :( nsmutabledata*) Data Store the downloaded data to the nsdate object. After the download is complete, run -(Void)

First, define two interfaces () Interface 1: Interface 2: Implemented through Delegate: (the first class delegates some of its events to the ViewDelegate class to complete, and the second class operates on this proxy, that is, it assigns it a

Table Structure: NSEntityDescription is equivalent to a table in the database. TA describes an abstract data type: eg: // + insertNewObjectForEntityForName: inManagedObjectContext: Factory method, which is described according to the given Entity,

UIImage * im = [UIImage imageWithContentsOfFile: path]; // obtain the image NSData * data = UIImagePNGRepresentation (im) through the path of the path ); // obtain image data/* There are two methods for obtaining images in ios:

// Set the context. The UIView object will create a graphical context for the current description environment, that is, obtain the current UIView (the one you want to move) CGContextRef context = UIGraphicsGetCurrentContext (); // start to draw the

The NSXMLParser of iOS SDK parses XML documents in the event-driven mode, that is, the XML Format documents are parsed In the SAX mode. When NSXMLParser encounters some elements (elements, attributes, CDATA blocks, comments, and so on) in the

Initialize AVAudioRecorder and set the recording parameters and storage address: // Set recording * recordsetting = [[audio alloc] init] autorelease]; // set the recording format avformatidkey = kaudioformatlinearpcm [recordsetting setvalue:

When using the list interface, we all know that -(NSInteger) tableView :( UITableView *) tableView numberOfRowsInSection :( NSInteger) section(Method 1) This method returns several rows of data on this interface, while -(UITableViewCell *)

Create a project: Create a simple view interface in the Model, while the ViewController class is a table interface. Create a table: Step 1: Step 2: Note: Select UITableViewController for Subclass. Next, click create. =- =-= In the

Document directory Various problems may occur during the process of adding. At this time, we need to determine what is not written or what is not done: 1. For definition in the class, be sure to add IBOutlet 2. associate with the class 3. Be

Parse the xml again and have some understanding. If there is something wrong, please point it out to the younger brother. Thank you! Zhang Yi Zhang 'er 20 Zhang San 21 Zhang Si 22 Li Yi Li 'er 20 Lee San 21 li

Open the camera: // Set sourceType to the camera first, and then determine whether the camera is available (ipod) without a camera. You cannot set sourceType to the Photo Library UIImagePickerControllerSourceType sourceType =

// Nsdata complies with the nscopying nscoding protocol. It provides object-oriented array storage for byte // applicable and read/write files, while a buffer zone is required for file read/write, nsdate provides such a cache zone // defines a