[英]issue in running method on main thread
我在主线程上运行方法时遇到问题,因为我尝试了GCD NSOperation,但此处无任何操作。 让我向您展示代码并解释其中的更多内容,
// method which get called first
- (NSArray*) calendarMonthView:(TKCalendarMonthView*)monthView
marksFromDate:(NSDate*)startDate
toDate:(NSDate*)lastDate
{
[self fatchAllEvent];
// prints null here it generate all event array which i need to use in below method
NSLog(@"all event %@",events);
[self generateRandomDataForStartDate:startDate endDate:lastDate];
return self.dataArray;
}
-(void)fatchAllEvent
{
eventStore = [[EKEventStore alloc] init];
if([eventStore respondsToSelector:@selector(requestAccessToEntityType:completion:)]){
__block typeof (self) weakSelf = self;
[eventStore requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error){
if(granted){
NSLog(@"granted");
[weakSelf performSelectorOnMainThread:@selector(allCalendarEvent)
withObject:nil
waitUntilDone:YES];
//You can see that i have performed on main thread and wait until done
}
else{
NSLog(@"Not granted");
}
}];
}
else{
[self allCalendarEvent];
}
}
-(void)allCalendarEvent
{
NSDate *startDate = [NSDate distantPast];
NSDate *endDate = [NSDate distantFuture];
NSMutableDictionary *eventsDict = [NSMutableDictionary dictionaryWithCapacity:1024];
NSDate* currentStart = [NSDate dateWithTimeInterval:0
sinceDate:startDate];
int seconds_in_year = 60*60*24*365;
while([currentStart compare:endDate] == NSOrderedAscending){
NSDate* currentFinish = [NSDate dateWithTimeInterval:seconds_in_year
sinceDate:currentStart];
if([currentFinish compare:endDate] == NSOrderedDescending){
currentFinish = [NSDate dateWithTimeInterval:0 sinceDate:endDate];
}
NSPredicate *predicate = [eventStore predicateForEventsWithStartDate:currentStart
endDate:currentFinish
calendars:nil];
[eventStore enumerateEventsMatchingPredicate:predicate
usingBlock:^(EKEvent *event, BOOL *stop) {
if(event){
[eventsDict setObject:event
forKey:event.eventIdentifier];
}
}];
currentStart = [NSDate dateWithTimeInterval:(seconds_in_year + 1)
sinceDate:currentStart];
}
events = [eventsDict allValues];
NSLog(@"all event %@",events); // this gets print after some seconds of the method where i need is already executed
}
我想要的是它不应该在所有步骤完成之前就取得成功,然后才继续前进,这样我就可以在需要的地方使用事件数组。
您需要改变主意。 包含数据的第二个日志是正确的。 当您获取数据时,应该更新UI或使用它。 您不应该试图/不想阻塞主线程来等待数据可用。
您的calendarMonthView
方法可以将一个块作为参数,可以调用该块以返回数组。
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