ios programming for dummies

IOS programming-UIWindow switching and iosuiwindow Switching Because a custom bottom pop-up window effect needs to be created in the recent project, I studied UIActionSheet and planned to rewrite a custom pop-up window. I was lazy when I wrote the demo, directly in -(Void) viewDidLoad {} The window switch test code is written, and the following error message is displayed during debugging: Terminating ap

. //取消,可以恢复的取消操作7. //resumeData 可以用来恢复下载的数据 并不是沙盒中保存的已经下载好的文件数据8. [self.downloadTask cancelByProducingResumeData:^(NSData * _Nullable resumeData) {9. self.resumeData = resumeData;10. }];11.12. self.downloadTask = nil;13. NSLog(@"取消下载任务+++");14.}2-3. Resume Download Task:1.- (IBAction)resumeBtnClick:(id)sender2.{3. //暂停->恢复4. if(self.resumeData)5. {6. //取消->恢复7. //在恢复下载的时候,判断是否有可以用来进行恢复下载的数据,如果有那么就根据该数据创建一个新的网络请求8. self.downloadTask = [self.s

. AfhttprequestoperationmanagerB.nsurlsessionI.afurlsessionmanagerIi. AfhttpsessionmanagerC.reachabilityD.serializationI.afurlrequestserialization serialization processor for request data1.AFHTTPRequestSerializer2.AFJSONRequestSerializer3.AFPropertyListRequestSerializerIi. Afurlresponseserialization serialization processor for response data1.AFHTTPResponseSerializer2.AFJSONResponseSerializer3.AFXMLParserResponseSerializer4.AFXMLDocumentResponseSerializer5.AFPropertyListResponseSerializer6.AFImag