HTTP defines a way to transmit data between the server and the client.
A URL defines a way to uniquely identify the location of a resource on the network.
REQUESTS and RESPONSES:
The client first establishes a TCP connection and then sends a
Displays the scroll bar of UIScrollView.
I checked the UIScrollView methods and attributes and found that there is no corresponding method. Only one flashScrollIndicators is relatively reliable, but it only shows the scroll bar for a short time and
The message mechanism NSNotificationCenter has been frequently used, but does not have a good understanding of its principles. Today, it takes some time to repeat the principles of the message mechanism to the end. IOS provides a "synchronous"
Storyboard is very convenient to visually design the cells of tableview and tableview. However, some people may have come from hand-written code controls in the early days, so there are some important points here.
1. registerClass cannot be used
2.
I have never carefully read the usage of KVC. I assume that any key-value pair can be stored in the NSObject object. I encountered a problem when using the result.
A simple displacement Animation:
CAKeyframeAnimation *keyPosi=[CAKeyframeAnimation
1. Touch the screen with your fingers to generate an event object
2. The system will add this event object to the event queue (first-in-first-out ).
3. The UIApplication extracts the event object from the event queue for processing.
4.
When accessing the App Store, users like to install and download attractive applications, but decide that users can only determine their attractiveness and functions through the application before downloading. If you want to design an app by
When users look for new apps in the Apple App Store, they often consider whether to buy them based on design. In our life, many may warn us not to judge a book by its cover. Since we cannot try an application, it becomes an important basis for us to
The iphone/ipad keyboard-less design is to win more display space for the screen. The large screen provides a better user experience in viewing pictures, text, and videos. The touch screen is the main method for iOS devices to accept user input,
The AssetsLibrary framework provides the ALAssetsLibrary class to help us access the photos and videos managed by the album program. See this for official documentation.
If (! Self. assetsLibrary ){_ AssetsLibrary = [[ALAssetsLibrary alloc]
1. When int type variables are required, you can use int or NSInteger, just like the program that writes C, but NSInteger is recommended, in this case, you do not need to consider whether the device is 32-bit or 64-bit.2. NSUInteger is unsigned,
When the actionSheet is on the same page as the ToolBar or TabBar, the ToolBar or TabBar block the button clicking function on the actionSheet. However, the buttons on the actionsheet can still be displayed normally, but cannot be clicked. Instead
1. I wrote a small Demo to implement up and down movement:
The main code is as follows:
-(IBAction) upChange :( id) sender {
If (typeView = down ){
[Self. downBtn setHidden: NO];
[Self. upBtn setHidden: NO];
[UIView animateWithDuration: 0.5
At the beginning, a code like this may be written in the button event:
If (isExpand ){
[LblBrief setNumberOfLines: 2];
LblBrief. text = [StringUtil subString: strBrief AndSubLength: 90];
[BtnBrief setImage: [UIImage imageNamed: @ "detailBriefDown"]
The location of symbolicatecrash in Xcode 4.3 is different from that in earlier versions.
/Applications/Xcode. app/Contents/Developer/Platforms/iPhoneOS. platform/Developer/Library/PrivateFrameworks/DTDeviceKit.
Like C, Objective-C provides some standard macros that describe the number of lines of the current file, source code file, and function information. Objective-C also provides related class types. Can be applied to debugging and error handling
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