xcode 如何在Objective-C中创建一个字符串或浮点数组
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how to create an array of string or float in Objective-C
提问by Desmond
i need some help here, i need to know how to create an array of string retrieved from an array. i'm using powerplot for graph and it only accept float or string array.
我需要一些帮助，我需要知道如何创建从数组中检索的字符串数组。我正在使用 powerplot 作为图形，它只接受浮点数或字符串数组。
i need to create something something like this dynamically.
我需要动态地创建这样的东西。
NSString * sourceData[7] = {@"2", @"1", @"4", @"8", @"14", @"15", @"10"};
NSString * sourceData[7] = {@"2", @"1", @"4", @"8", @"14", @"15", @"10"};
Below are my code to find out the numbers in strings.
下面是我找出字符串中数字的代码。
NSInteger drunked = [appDelegate.drinksOnDayArray count];
NSMutableArray * dayArray = [[NSMutableArray alloc] init];
NSMutableArray * sdArray = [[NSMutableArray alloc] init];
//float *sdArray[7];
for (int i=0; i<drunked; i++) {
DayOfDrinks *drinksOnDay = [appDelegate.drinksOnDayArray objectAtIndex:i];
NSString * dayString= [NSDate stringForDisplayFromDateForChart:drinksOnDay.dateConsumed];
[dayArray addObject:dayString];
NSLog(@"%@",[dayArray objectAtIndex:i]);
drinksOnDay.isDetailViewHydrated = NO;
[drinksOnDay hydrateDetailViewData];
NSString * sdString= [NSString stringWithFormat:@"%@", drinksOnDay.standardDrinks];
[sdArray addObject:sdString];
NSString *tempstring;
NSLog(@"%@",[sdArray objectAtIndex:i]);
}
thanks for the help :)
谢谢您的帮助 ：）
回答by Faizan S.
Array's in Objectice-C aren't that hard to work with:
Objectice-C 中的数组并不难处理：
NSMutableArray *myArray = [NSMutableArray array];
[myArray addObject:@"first string"]; // same with float values
[myArray addObject:@"second string"];
[myArray addObject:@"third string"];
int i;
int count;
for (i = 0, count = [myArray count]; i < count; i = i + 1)
{
NSString *element = [myArray objectAtIndex:i];
NSLog(@"The element at index %d in the array is: %@", i, element); // just replace the %@ by %d
}
You can either use NSArrayor NSMutableArray- depending on your needs, they offer different functionality.
您可以使用NSArray或NSMutableArray- 根据您的需要，它们提供不同的功能。
Following tutorial covers exactly what you are looking after:
以下教程涵盖了您正在关注的内容：
回答by larsacus
You can also add the elements to the array when you init (and optionally add them later only if you are using the Mutableversion of a collection class:
您还可以在初始化时将元素添加到数组中（并且仅当您使用Mutable集合类的版本时才可以选择稍后添加它们：
NSMutableArray *myArray = [[NSMutableArray alloc] initWithObjects:@"2", @"1", @"4", @"8", @"14", @"15", @"10", nil];
[myArray addObject:@"22"];
[myArray addObject:@"50"];
//do something
[myArray release];
回答by Luis
You can use malloc to create a C-style array. something like this should work:
您可以使用 malloc 创建一个 C 风格的数组。这样的事情应该工作：
NSString **array = malloc(numElements * sizeof(NSString *))
some code here
free(array)
Be aware that unlike NSMutable array, c arrays won't do a retain, so you have to manage it if needed. And don't forget the free
请注意，与 NSMutable 数组不同，c 数组不会保留，因此您必须在需要时对其进行管理。并且不要忘记免费
