我正在基于来自API的json数据为节/行创建一个多维数组。查看日志，添加的行和部分看起来不错，但是当我记录这些部分时，它只显示了一堆最后一个对象。似乎没有将行添加到部分中。
在x次的部分中显示最后一个API对象我做错了什么？ x代表json计数。 self.appointments是NSArray *
根据objective-c multi-dimensional array它应该有用。
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSMutableArray *sections = [[NSMutableArray alloc] init];
NSMutableArray *rows = [[NSMutableArray alloc] init];
NSString *lastDate = nil;
for (NSDictionary *dict in [json objectForKey:@"data"]) {
NSString *date = [dict objectForKey:@"date"];
NSLog(@"Dates: %@ - %@", date, lastDate);
if (date != lastDate) {
if (lastDate == nil) {
NSLog(@"Adding Row 1");
[rows addObject:dict];
lastDate = date;
} else {
NSLog(@"Adding Section 1");
NSLog(@"Adding #rows %i",[rows count]);
[sections addObject:rows];
[rows removeAllObjects];
NSLog(@"Adding Row 2 %@",[dict objectForKey:@"start_time"]);
[rows addObject:dict];
lastDate = date;
}
} else {
NSLog(@"Adding Row 3");
[rows addObject:dict];
}
}
if (rows) {
NSLog(@"Adding Section 2");
NSLog(@"Adding #rows %i",[rows count]);
[sections addObject:rows];
}
NSLog(@"Sections: %@", sections);
self.appointments = [sections mutableCopy]; //I have also tried self.appointments = sections
sections = nil;
rows = nil;
日志显示
Sections: (
(
{
abbrev = "";
account = "";
"addOnService_id" = "";
alert = "";
"appt_id" = 1839384;
"appt_id_unique" = 1839384;
"appt_status_description" = "";
"appt_status_type" = "";
"c_id" = 47;
cost = "0.00";
"coupon_id" = "";
"creation_emp_id" = 2288;
"creation_timestamp" = 201111040717;
"customer_id" = 0;
"customer_notes" = "";
"customer_package_id" = "";
date = 20121228;
"employee_id" = 2288;
"employee_notes" = "";
employer = "";
"end_time" = 570;
"first_name" = "";
"history_id" = 1830959;
key = 134;
"last_emp_id" = 2288;
"last_name" = "";
"last_timestamp" = 201111040717;
"lead_description" = "";
"link_id" = 0;
"location_name" = "Telephonic Setup/Training";
"make_id" = "";
"middle_name" = "";
"model_id" = "";
"model_year" = "";
name = "My Name ";
odometer = "";
"other_vehicle" = "";
"package_name" = "";
"payment_type_description" = "";
"payment_type_id" = "";
"pet_id" = "";
"po_number" = "";
reason = "B.O.B";
"rebook_id" = "";
"recur_id" = 20954;
"rep_id" = "";
"room_id" = 0;
"room_name" = "";
service = "";
"service_id" = 0;
"service_time_description" = "";
spots = 1;
"staff_screen_name" = "John Smith";
"staff_type_id" = 0;
"start_time" = 540;
"status_id" = 0;
tip = "";
"type_id" = 8;
vin = "";
}
),
(
{
abbrev = "";
account = "";
"addOnService_id" = "";
alert = "";
"appt_id" = 1839384;
"appt_id_unique" = 1839384;
"appt_status_description" = "";
"appt_status_type" = "";
"c_id" = 47;
cost = "0.00";
"coupon_id" = "";
"creation_emp_id" = 2288;
"creation_timestamp" = 201111040717;
"customer_id" = 0;
"customer_notes" = "";
"customer_package_id" = "";
date = 20121228;
"employee_id" = 2288;
"employee_notes" = "";
employer = "";
"end_time" = 570;
"first_name" = "";
"history_id" = 1830959;
key = 134;
"last_emp_id" = 2288;
"last_name" = "";
"last_timestamp" = 201111040717;
"lead_description" = "";
"link_id" = 0;
"location_name" = "Telephonic Setup/Training";
"make_id" = "";
"middle_name" = "";
"model_id" = "";
"model_year" = "";
name = "My Name ";
odometer = "";
"other_vehicle" = "";
"package_name" = "";
"payment_type_description" = "";
"payment_type_id" = "";
"pet_id" = "";
"po_number" = "";
reason = "B.O.B";
"rebook_id" = "";
"recur_id" = 20954;
"rep_id" = "";
"room_id" = 0;
"room_name" = "";
service = "";
"service_id" = 0;
"service_time_description" = "";
spots = 1;
"staff_screen_name" = "John Smith";
"staff_type_id" = 0;
"start_time" = 540;
"status_id" = 0;
tip = "";
"type_id" = 8;
vin = "";
}
), ... over and over again.
答案 0 :(得分：2)
使用：
[sections addObject:rows];
[rows removeAllObjects];
[rows addObject:dict];
您继续添加相同的rows对象而不是新对象，并不断更改内容，以便每次显示最后的内容。
尝试：
[sections addObject:[rows mutableCopy]];
[rows removeAllObjects];
[rows addObject:dict];
这样每次都会添加一个新行。
也许更好：
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSMutableArray *sections = [NSMutableArray array];
NSMutableArray *rows = [NSMutableArray array];
NSString *lastDate = nil;
for (NSDictionary *dict in [json objectForKey:@"data"]) {
NSString *date = [dict objectForKey:@"date"];
if ([date isEqualToString:lastDate] == NO) {
if (lastDate == nil) {
[rows addObject:dict];
lastDate = date;
} else {
[sections addObject:rows];
rows = [NSMutableArray array];
[rows addObject:dict];
lastDate = date;
}
[rows addObject:dict];
}
}
if (rows) {
[sections addObject:rows];
}
self.appointments = sections;
请注意，为对象分配0不会释放它，release会释放它。但是如果你使用便捷方法创建对象，那么它们是自动释放的，不需要进一步的操作来释放它们。
另请注意，在比较字符串时，需要使用isEqualToString:方法来比较内容，只需使用=或!=仅比较字符串的地址。