numberofSectionInTablesView/NumberofRowsInsection

问题描述

我在返回numberofSections/numberofRows时遇到麻烦.我有一本充满数据的字典

I am having trouble returning the numberofSections/numberofRows. I have a dictionary full of data

-(void)setUpContacts{
//set up the contacts
NSString *string = @"ABCDEFGHIJKLMNOPQRSTUVWXYZ";

letterArray = [[NSMutableDictionary alloc]init];

Contacts *contact = [[Contacts alloc]init];
contactNumbers = [contact phoneNumbers];

for (NSDictionary* info in contactNumbers) {
    firstLetter = [info objectForKey:@"lastName"];
    index = @"_";
    if([firstLetter length] > 0){
        firstLetter =[firstLetter substringToIndex:1];
        firstLetter= [firstLetter capitalizedString];
        NSRange range = [string rangeOfString:firstLetter];
        if(range.length >= 0){
            index= firstLetter;
        }
    }
    if(![letterArray objectForKey:index]){
        
        [letterArray setValue:[NSMutableArray array] forKey:index];
    }
    [[letterArray objectForKey:index] addObject:info];
    
}
NSLog(@"%@",letterArray);}

和它的NSLogs

C =     (
            {
        firstName = Alex;
        kind = Mobile;
        lastName = Chang;
        name = "Alex Chang (Mobile)";
        number = "[phone]";
    },
            {
        firstName = YuYu;
        kind = Mobile;
        lastName = Chen;
        name = "YuYu Chen (Mobile)";
        number = "[phone]";
    },
            {
        firstName = Chris;
        kind = Mobile;
        lastName = Choi;
        name = "Chris Choi (Mobile)";
        number = "[phone]";
    },
            {
        firstName = Kevin;
        kind = Mobile;
        lastName = Chung;
        name = "Kevin Chung (Mobile)";
        number = "1 [phone]";
    }
);
H =     (
            {
        firstName = Danny;
        kind = Mobile;
        lastName = Huang;
        name = "Danny Huang (Mobile)";
        number = "[phone]";
    },
            {
        firstName = Ice;
        kind = Mobile;
        lastName = Huang;
        name = "Ice Huang (Mobile)";
        number = "[phone]";
    }
);
K =     (
            {
        firstName = Will;
        kind = Mobile;
        lastName = King;
        name = "Will King (Mobile)";
        number = "[phone]";
    }
);
L =     (
            {
        firstName = "";
        kind = iPhone;
        lastName = LastName;
        name = " LastName (iPhone)";
        number = "[phone]";
    },
            {
        firstName = david;
        kind = Mobile;
        lastName = lub;
        name = "david lub (Mobile)";
        number = "[phone]";
    }
);

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView;方法如何检索索引的节数；

for the -(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView; methodhow do i retrieve the number of sections for index;

以及-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)部分；方法，我该如何获取该部分中的行数?

and for the -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section; method, how do i retreive the number of rows in the section?

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
NSArray *array = [letterArray mutableCopy];
return [[array objectAtIndex:section]count];}

它给了我这个错误:-[__ NSCFDictionary objectAtIndex:]:无法识别的选择器发送到实例0x8434cc0

and it gives me this error: -[__NSCFDictionary objectAtIndex:]: unrecognized selector sent to instance 0x8434cc0

提前谢谢

推荐答案

对于-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView，您应该执行以下操作:

for -(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView you should do something like this:

return [letterArray count];

对于-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)部分，您应该执行以下操作:

for -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section you should do something like this:

NSArray *array = letterArray;
return [[array objectAtIndex:section] count];

编辑试试这个:

-(NSArray *)getLetterArrayCount {
    NSMutableArray *countArray = [[NSMutableArray alloc] init];
    NSNumber *subCount;

    for (id key_main in letterArray) {
        subCount = 0;

        for (id key_sub in [letterArray objectForKey:key_main]) {
            subCount = [NSNumber numberWithInt:[subCount intValue] + 1];
        }

        [countArray addObject:subCount];
    }
    return countArray;
}

您应该调用一次并将其保存到类变量中，然后在各节中这样调用它:

You should call it once and save it to a class variable and call it like this for sections:

[countArray count];

对于这样的部分中的行:

And for the rows in a section like this:

[[countArray objectAtIndex:section] intValue];

这篇关于numberofSectionInTablesView/NumberofRowsInsection的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！