IOS: DrawRect & amp; CoreText, iosdrawrect

IOS: DrawRect & CoreText, iosdrawrect -(Void) drawRect :( CGRect) rect {// Drawing code // Quartz 2D painting environment, a canvas CGContextRef context = UIGraphicsGetCurrentContext (); // border circle background circle CGContextSetRGBStrokeColor (

Foundation framework, foundation

Foundation framework, foundation Foundation framework1. Foundation Course Arrangement1. NSObject, NSString, NSMutableString2. NSNumber, NSValue, NSDate, and NSArray NSMutableArray3. NSArray traversal, new NSArray syntax (IOS6), NSArray Copy, and

Tab implementation principle, Tab implementation principle

Tab implementation principle, Tab implementation principle 1: implement the class rolling effect of the header The main code is as follows: UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 64, screen_width, 40)];

# Document name: use Objective-C for programming,

# Document name: use Objective-C for programming, # Document name: use Objective-C for programming # Objective-C (OC) When writing programs for iOS and OS X, Objective-C is the main language used by programmers. OC is an extension set of C language.

Ios ui basics 07 and iosui07

Ios ui basics 07 and iosui07 TableView Attribute// Set the cell height of each row @ property (nonatomic) CGFloat rowHeight; // set the height of each set of headers @ property (nonatomic) CGFloat sectionHeaderHeight; // set the split line

The @ selector function in iOS transmits multiple parameters.

The @ selector function in iOS transmits multiple parameters. 1. In general, use the self generator mselector: SEL withObject: id method.   [self performSelectorOnMainThread:@selector(testAA:) withObject:[NSArray arrayWithObjects:@1,@2, nil]

IOS UIWenView adjust page font size

IOS UIWenView adjust page font sizeIOS UIWenView adjust page font size IOS UIWenView:  FontSizeChangeViewController. h   #import @interface FontSizeChangeViewController : UIViewController{ UIToolbar *toolBar;}@property (weak, nonatomic)

Basic for iOS development: Create a Table View application in three different ways

Basic for iOS development: Create a Table View application in three different ways In iOS, the most common control is Table View, which can be understood as a list. In Android, It is a ListView. It is often used in News clients, mailboxes, memos,

IOS calls the browser safari

IOS calls the browser safariNote: Apple mobile phone testing (real machine testing) is required as follows)I. Two ways to make a call// Call method 1 (a prompt is displayed, indicating whether to call or not. This is recommended)   UIWebView *

IOS development note _ multi-thread dependency in AFN

IOS development note _ multi-thread dependency in AFN   We usually encounter two network requests at the same time during development, and then download the resources and merge them. What should we do in AFN? Of course, some personal packaging

UITextFieldDelegate protocol, uitextfielddelegate

UITextFieldDelegate protocol, uitextfielddelegate   Many people think that UITextField is very simple. Why does it write this protocol? Because it may be used in actual development;   For example: The underline color under the text box changes with

UITableViewDataSource protocol, uitableview

UITableViewDataSource protocol, uitableview Preface: In iOS development, table view UITableView is an important view for UI design. What protocols do you need to comply with when using Table view UITableView?   UITableViewDataSource table View data

IOS-Safe Transmission of user passwords, ios-transmission of user passwords

IOS-Safe Transmission of user passwords, ios-transmission of user passwords Correct practice: generate a pair of public and private keys for encryption in advance. When the client logs on, it uses the public key to encrypt the user's password and

Ios ui basics 06 and iosui06

Ios ui basics 06 and iosui06 Autoresizing 1. Functions of the four lines around Autoresizing: As long as you select the previous one, the distance between the current control and the parent control is fixed. What is the current

Add watermarks for iOS photos and for iOS photos

Add watermarks for iOS photos and for iOS photos During the project, we need to mark the photos to prevent image theft by others. Therefore, we need to add a watermark to the photo to indicate its uniqueness. Adding a watermark is not to add several

Delete IOS UITableView and iosuitableview

Delete IOS UITableView and iosuitableview UITbableView is used as the list display information. In addition to the display function, it is sometimes used for deletion, such as a shopping cart. You can directly use the system-provided delete function

NSArray sorting methods

NSArray sorting methods /* In general, arrays commonly used in OC are sorted by sortedArrayUsingSelector: sortedArrayUsingComparator: sortedArrayUsingDescriptors: * // * 1. sortedArrayUsingSelector, you can use sortedArrayUsingSelector: method. The

IOSQuartz2D-03-customized personalized Avatar

IOSQuartz2D-03-customized personalized Avatar Cut an image into a circle and display the border of the specified width and color around the image. Implementation It is mainly composed of two parts of different sizes. The blue background area is

IOS multithreading technology 2

IOS multithreading technology 2IOS multithreading technology 2 NSOperation NSInvocationOperation // Create a queue NSOperationQueue * queue = [[NSOperationQueue alloc] init]; // create a subtask, define a subtask to be a subclass of NSOperation

IOS development completes C language every minute-struct and enumeration

IOS development completes C language every minute-struct and enumeration I. structIn the previous array sharing, we saved data of the same type through an array. We can use an array to represent this whole, but the array has the following features:

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