记录学习中遇到的问题
出问题的写法，定义方法请求网络数据，直接在调用方法的页面用数组接收返回的数组。偶尔会出现程序崩溃情况
-(NSMutableArray *)requestAllDataWithListId:(NSString *)listId{
NSMutableArray *resultArray = [NSMutableArray array];
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
NSString *urlStr = [NSString stringWithFormat:kLOLMoviesWithAuthor, listId];
[manager GET:urlStr parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSString *html = operation.responseString;
NSData* data=[html dataUsingEncoding:NSUTF8StringEncoding];
id dict=[NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSArray *array = dict[@"videos"];
for (NSDictionary *dic in array) {
LOLSomeOneProgramListModel *model = [[LOLSomeOneProgramListModel alloc] init];
[model setValuesForKeysWithDictionary:dic];
[resultArray addObject:model];
}
dispatch_async(dispatch_get_main_queue(), ^{
self.result();
});
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
}];
return resultArray;
}
导致程序崩溃的原因是，上面返回的数组是在block体中数据不确定有没有请求下来的情况下执行的，
正确写法，在请求完数据后通过block体回调把要返回的值作为参数传出去
-(void) requestAllDataWithListId:(NSString *)listId{
NSMutableArray *resultArray = [NSMutableArray array];
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
NSString *urlStr = [NSString stringWithFormat:kLOLMoviesWithAuthor, listId];
[manager GET:urlStr parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSString *html = operation.responseString;
NSData* data=[html dataUsingEncoding:NSUTF8StringEncoding];
id dict=[NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSArray *array = dict[@"videos"];
for (NSDictionary *dic in array) {
LOLSomeOneProgramListModel *model = [[LOLSomeOneProgramListModel alloc] init];
[model setValuesForKeysWithDictionary:dic];
[resultArray addObject:model];
}
dispatch_async(dispatch_get_main_queue(), ^{
self.result(resultArray);
});
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
}];
}