一、按顺序多次从一个接口请求数据
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//按顺序请求语数英三门学科的数据；
- (void)getAllSubjectHomeworkData {
if (self.subjectCountData.list.count == 0) {
return;
}
dispatch_queue_t queueUploadBegin = dispatch_queue_create("com.getAllSubjectHomeworkData.subsystem.tast", DISPATCH_QUEUE_SERIAL);
dispatch_semaphore_t semaphoreBegin = dispatch_semaphore_create(1); //设置信号总量为1，保证只有一个进程执行；
for (NSInteger i = 0; i < self.subjectCountData.list.count; i ++) {
SSTSubjectCountModel *subModel = self.subjectCountData.list[i];
[subModel.homeworkListModel.list removeAllObjects]; //先清空数据；
NSInteger pageNO = 1;
NSInteger pageSize = subModel.workCount;
NSString *subjectName = subModel.subject;
if (pageSize > 0) {
dispatch_async(queueUploadBegin, ^{
dispatch_semaphore_wait(semaphoreBegin, DISPATCH_TIME_FOREVER); //等待信号量
NSString *classId = [[NSUserDefaults standardUserDefaults] objectForKey:kCorrectClassId];
NSDictionary *params = @{@"pageNo":@(pageNO),@"pageSize":@(pageSize),@"type":@"0",@"subject":subjectName.length>0?subjectName:@"", @"classId":classId.length?classId:@""};
WEAKSELF(weakSelf);
NSLog(@" --- 正在请求%@科目的数据 --- ",subjectName);
[XWHttpClient xw_postWithUrlString:AppendURL(kHomeworkList) Params:params DefaultHUD:NO SuccessBlock:^(id returnValue) {
SSTCorrectHomeworkListModel *tempModel = [SSTCorrectHomeworkListModel mj_objectWithKeyValues:DicGetValue(returnValue, @"data")];
subModel.homeworkListModel = tempModel;
dispatch_semaphore_signal(semaphoreBegin);
if (i == weakSelf.subjectCountData.list.count - 1) {
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@" --- 全部学科的数据请求完毕 --- ");
});
}
} ErrorBlock:^(id errorCode) {
dispatch_semaphore_signal(semaphoreBegin);
} FailureBlock:^(id failureInfo) {
dispatch_semaphore_signal(semaphoreBegin);
}];
});
}
}
}
二、按顺序添加多个View
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- (void)createLocationViews {
dispatch_queue_t queueUploadBegin = dispatch_queue_create("com.createLocationViews.subsystem.tast", DISPATCH_QUEUE_SERIAL);
dispatch_semaphore_t semaphoreBegin = dispatch_semaphore_create(1); //设置信号总量为1，保证只有一个进程执行；
__block ViewController *weakSelf = self;
for (NSInteger i = 0; i < self.loacationArr.count; i ++) {
LocationModel *subModel = self.loacationArr[i];
dispatch_async(queueUploadBegin, ^{
dispatch_semaphore_wait(semaphoreBegin, DISPATCH_TIME_FOREVER); //等待信号量；
dispatch_time_t delayTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5*NSEC_PER_SEC));
dispatch_after(delayTime, dispatch_get_main_queue(), ^{
NSLog(@" --- 添加 locationView 第 %ld 个 --- ", i);
UIView *locationView = [[UIView alloc] initWithFrame:CGRectMake(subModel.location_X, subModel.location_Y, 30, 30)];
locationView.backgroundColor = [weakSelf randomColor];
locationView.layer.cornerRadius = 15;
locationView.layer.masksToBounds = YES;
locationView.alpha = 0.0;
[weakSelf.view addSubview:locationView];
[UIView animateWithDuration:0.5 animations:^{
locationView.alpha = 1.0;
dispatch_semaphore_signal(semaphoreBegin);
if (i == weakSelf.loacationArr.count - 1) {
NSLog(@" --- locationView 添加完毕 --- ");
}
}];
});
});
}
}
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