ios - 在 nsarray of nsdictionaries 中搜索性能内存优化方式

Question

这个问题是基于性能的，我得到了想要的结果。我有一系列这样的字典:

Printing description of arrAppointmentDictionary:
<__NSArrayM 0x16f962a0>(
{
"component_id" = 159;
total = 1;
},
{
"component_id" = 165;
total = 1;
},
{
"component_id" = 177;
total = 1;
},
{
"component_id" = 191;
total = 1;
},
{
"component_id" = 193;
total = 1;
}
)

我根据这样的键在字典中搜索:

for (int i = 0; i<arrAppointmentDictionary.count; i++)
{
    NSMutableDictionary *appointmentDictionary = [arrAppointmentDictionary objectAtIndex:i];
    NSArray *keys = [appointmentDictionary allKeys];
    for (NSString *key in keys)
    {
        @autoreleasepool {
            NSLog(@"Key is %@", key);
            if([[appointmentDictionary objectForKey: key] isEqualToString:[rs stringForColumn:@"id"]])
            {
                layout.numberOfAppointments = [appointmentDictionary objectForKey: @"total"];
                NSLog(@"number of appointments are >>>>>>>>>>>>>>>>> %@", [appointmentDictionary objectForKey: @"total"]);
            }
        }
    }
}

我得到的结果是准确的。当从另一个 while 循环调用此 for 循环时，如何提高该 for 循环的性能/内存优化。

谢谢和问候。

Answer 1

这是一种方法:

NSString *wantedId = [rs stringForColumn:@"id"];
for (NSMutableDictionary *appointmentDictionary in arrAppointmentDictionary) {
    if ([appointmentDictionary[@"id"] isEqualToString:wantedId]) {
        layout.numberOfAppointments = appointmentDictionary[@"total"];
        NSLog(@"number of appointments are >>>>>>>>>>>>>>>>> %@", appointmentDictionary[@"total"]);
        break;
    }
}