ios 如何使用for循环将对象添加到NSArray？
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How to add objects to an NSArray using for loop?
提问by Madan Mohan
I want to add the [NSDecimalNumber numberWithInt:i]to an array using for loop.
我想[NSDecimalNumber numberWithInt:i]使用 for 循环将其添加到数组中。
It is hardcoded :
它是硬编码的：
NSArray *customTickLocations = [NSArray arrayWithObjects: [NSDecimalNumber numberWithInt:1],[NSDecimalNumber numberWithInt:2],[NSDecimalNumber numberWithInt:3],[NSDecimalNumber numberWithInt:4],[NSDecimalNumber numberWithInt:5],[NSDecimalNumber numberWithInt:6],[NSDecimalNumber numberWithInt:7],[NSDecimalNumber numberWithInt:8],[NSDecimalNumber numberWithInt:9],[NSDecimalNumber numberWithInt:10],[NSDecimalNumber numberWithInt:11],[NSDecimalNumber numberWithInt:12],nil];
I want like this, but I can add only one object here....
我想要这样，但我只能在这里添加一个对象....
for (int i=0; i<totalImagesOnXaxis; i++)
{
customTickLocations = [NSArray arrayWithObject:[NSDecimalNumber numberWithInt:i]];
}
Please help me out of this, Thanks in Advance, Madan
请帮我解决这个问题，提前致谢，马丹
回答by EmptyStack
NSArrayis immutable. Use the mutable version, NSMutableArray.
NSArray是不可变的。使用可变版本NSMutableArray。
回答by justin
NSMutableArray * customTickLocations = [NSMutableArray new];
for (int idx = 0; idx < 12; ++idx) {
[customTickLocations addObject:[NSDecimalNumber numberWithInt:idx]];
}
...
回答by Warewolf
you cannot add Objects at run time to NSArray.For adding or removing objects at Run time you have to use NSMutableArray.
您不能在运行时将对象添加到 NSArray。要在运行时添加或删除对象，您必须使用 NSMutableArray。
NSMutableArray *mutableArray=[[NSMutableArray alloc] init];
for (int i=0; i<10; i++) {
[mutableArray addObject:[NSDecimalNumber numberWithInt:i]];
}
回答by beryllium
NSMutableArray *customTickLocations = [NSMutableArray array];
for (int i=0; i<totalImagesOnXaxis; i++)
{
[customTickLocations addObject:[NSDecimalNumber numberWithInt:i]];
}
The NSMutableArray class declares the programmatic interface to objects that manage a modifiable array of objects. This class adds insertion and deletion operations to the basic array-handling behavior inherited from NSArray
NSMutableArray 类声明了管理可修改对象数组的对象的编程接口。这个类在继承自 NSArray 的基本数组处理行为中添加了插入和删除操作
回答by Radu
NSMutableArray *customTickLocations = [[NSMutableArray alloc] init];
for(int i = 0; i<WhateverNoYouWant;i++)
{
NSDecimalNumber * x = [NSDecimalNumber numberWithInt:i]
[customTickLocations addObject:x]
}
回答by simon_smiley
I found that using this technique is a great way to easily add a few more elements to an NSArray, this was the answer I was looking for when I came to this thread so am posting it as it is a great easy addition.
我发现使用这种技术是一种将更多元素轻松添加到 NSArray 的好方法，这是我来到此线程时正在寻找的答案，因此我将其发布，因为它是一个非常简单的添加。
If I want to add a new array to my current array
如果我想在当前数组中添加一个新数组
currentArray = [currentArray arrayByAddingObjectsFromArray: newArray];
回答by AmyNguyen
NSArrayadd object like this:
NSArray像这样添加对象：
NSArray *arr = @["1","2","3","4"];
I think NSArraycan not addObjectlike NSMutableArray. You should try it:
我想NSArray不能addObject喜欢NSMutableArray。你应该试试看：
NSMutableArray *mulArr = [NSMutableArray new];
[mulArr addObject:[NSDecimalNumber numberWithInt:number]];
