IOS learning: uitableview 2 (pull-down refresh)

 

1/* 2 implement the drop-down refresh of tableview 3 will this method be triggered when tableview slides? 4 */5-(void) tableview :( uitableview *) tableview willdisplaycell :( uitableviewcell *) cell forrowatindexpath :( nsindexpath *) indexpath 6 {7 // triggers 8 If (indexpath. row = self. m_data.count-1) {9 10 // define a uiview 11 uiview * footspinnerview = [[uiview alloc] initwithframe: cgrectmake (0.0f, 0.0f, 3201_f, 601_f)]; 12 13 // view 14 uiactivityindicatorview * Activity = [[refreshing alloc] initwithframe: cgrectmake (130.0f, 0.0f, 601_f, 601_f)]; 15 activity. color = [uicolor redcolor]; 16 [activity startanimating]; // start view 17 18 footspinnerview. backgroundcolor = [uicolor graycolor]; 19 [footspinnerview addsubview: activity]; 20 21 // set footerview 22 self. mytableview. tablefooterview = footspinnerview; 23 24 // self. mytableview. tableheaderview = footspinnerview; 25 26 dispatch_queue_t queue = dispatch_queue_create ("My queue", nil); 27 28 // Add data 29 dispatch_async (queue, ^ (void) to the background thread) {30 31 [self. m_data addobject: @ "1000"]; 32 [self. m_data addobject: @" 1001 "]; 33 [self. m_data addobject: @ "1002"]; 34 [self. m_data addobject: @ "1003"]; 35 [self. m_data addobject: @ "1004"]; 36 37}); 38 39 // reload the data after adding the data 40 dispatch_async (queue, ^ (void) {41 42 sleep (2); 43 dispatch_sync (dispatch_get_main_queue (), ^ (void) {44 45 [self. mytableview reloaddata]; 46}); 47}); 48 49 // [self. mytableview reloaddata]; 50 dispatch_release (Queue); 51 [footspinnerview release]; 52 [activity release]; 53} 54 // else if (indexpath. row = 0) {55 // 56 // uiview * footspinnerview = [[uiview alloc] initwithframe: cgrectmake (0.0f, 0.0f, 32020.f, 601_f)]; 57 // uiactivityindicatorview * Activity = [[uiactivityindicatorview alloc] initwithframe: cgrectmake (130.0f, 0.0f, 601_f, 601_f)]; 58 // activity. color = [uicolor redcolor]; 59 // [activity startanimating]; 60 // 61 // footspinnerview. backgroundcolor = [uicolor graycolor]; 62 // [footspinnerview addsubview: activity]; 63 // 64 // self. mytableview. tablefooterview = footspinnerview; 65 // 66 // self. mytableview. tableheaderview = footspinnerview; 67 // 68 // dispatch_queue_t queue = dispatch_queue_create ("My queue", nil); 69 // 70 // dispatch_async (queue, ^ (void) {71 // 72 // [self. m_data insertobject: @ "1000" atindex: 0]; 73 // [self. m_data addobject: @ "1001"]; 74 // [self. m_data addobject: @ "1002"]; 75 /// [self. m_data addobject: @ "1003"]; 76 /// [self. m_data addobject: @ "1004"]; 77 // [self. m_data insertobject: [nsarray arraywithobject: @ "01"] atindex: 0]; 78 // 79 //}); 80 // 81 // dispatch_async (queue, ^ (void) {82 // 83 // sleep (2); 84 // dispatch_sync (dispatch_get_main_queue (), ^ (void) {85 // 86 // [self. mytableview reloaddata]; 87 // [self. mytableview scrolltorowatindexpath: [indexpath initwithindex: 3] atscrollposition: uitableviewscrollpositionnone animated: Yes]; 88 //}); 89 //}); 90 // 91 // 92 // dispatch_release (Queue); 93 // [footspinnerview release]; 94 // [activity release]; 95 //} 96 97 // if it is not the last row, set both footerview and headerview to nil 98 else 99 {100 self. mytableview. table footerview = nil; 101 self. mytableview. tableheaderview = nil; 102} 103}