International trade event forecasts

iPhone background operation refers to allowing certain applications on International trade event forecaststhe iPhone device to do not end the operation of the application after the device is hibernating or the user exits the application. Compared with Android, the background operation of iOS systemIt is more strict and secure. In order to prevent applications from unnecessaryly consuming power and data in the background, only specific applications are allowed to run in the background. In the iOS system, developers need to use the background running API provided by Apple to realize the background operation of the application, while meeting the needs of developers and the limitations of the iOS system. So, how to enable the background operation function of iPhone? Next, I will introduce it to you in detail. I. Background operation mode In the iOS system, there are the following background operation modes: 1. Persistent background operation mode. This mode requires developers to apply to the system. It is mainly used for some applications that need to run for a long time, such as location services, voice calls, etc. In this mode, the application can run in the background for up to 180 seconds, and it can continue to run in the background after the application exits.However, it should be noted that if this mode is abused, it will lead to a severe consumption of device power, so it needs to be used with caution. Two. Background audio mode In this mode, the application can continue to play audio in the background, such as music player, voice dialogue, etc. However, it should be noted that applications in this mode need to call AVAudioSession to register, and the system will make corresponding adjustments and optimizations according to parameters such as album volume. 3. Background positioning mode This mode is suitable for applications that require location services for a long time, such as navigation, walking records, etc. In this mode, the application can continuously update the location information in the background, but it should be noted that this mode will consume a lot of power and data flow, so it is necessary to control the update rate and other parameters. Four. Background communication mode isThe mode is suitable for applications that need to synchronize data in real time in the background, such as mail, instant messaging, etc. In this mode, the application can synchronize data with the server in the background, but it should be noted that if the amount of data is too large in this mode, it will cause excessive power consumption. II. Enable the background operation of the application 1. Confirm whether the application supports background operation in the iOS system. Not all applications support background operation, so it is necessary to confirm whether it supports background operation. You can view and set a list of applications that support or do not support background operation in "Settings" - "General" - "Background Application Refresh". If you need to turn on the background operation of an application, you need to turn on the corresponding switch. Two. To enable the background operation mode of the application, you need to use the App.The background operation API provided by le is to call the background operation mode. The code example is as follows: // Open the background location locationManager.allowsBackgroundLocationUpdates = YES;// Turn on the background language Audio AVAudioSession *session = [AVAudioSession sharedInstance]; [session setCategory:AVAudioSessionCatego RyPlayback error:nil];[session setActive:YES error:nil];Just modify the corresponding application background running mode in the code. It should be noted that after turning on a background running mode, you also need to set it in "info.plist" to ensure that the background running mode can be enabled normally. III. Precautions 1. Security guarantee In order to ensure the security and stability of the device, the iOS system strictly controls and restricts the background operation of the application. Therefore, it is necessary to ensure that the background operation of the application is legal and necessary, and will not damage the performance and security of the user's device. Two. Power consumption control Long-term background operation will lead to the consumption of equipment power, so it is necessary to control the time and frequency of background operation to avoid excessive power consumption. At the same time, it is necessary to provide users with corresponding switches, so that users can choose whether to enable the background operation of an application.3. Data protection In background operation mode, the application may generate some additional data traffic and traffic costs, so it is necessary to ensure the stability and security of the data, while optimizing the way data transmission and the efficiency of traffic use. IV. Conclusion In short, enabling the background operation function of the iPhone application is a necessary operation, which can ensure that the application can still perform the necessary tasks after the device is dormant or the user exits the application. However, it should be noted that the background operation mode needs to be used cautiously to ensure that it will not cause unnecessary losses to the user's equipment and power. At the same time, it is necessary to ensure the safety and legality of the background operation, and to ensure the security of users' personal information and data.

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