xcode 将浮点值转换为 id。我怎样才能做到这一点？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/8413383/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Convert Float Value To id. How can i do this?
提问by Yusuf OZKAN
Possible Duplicate:
How can I store a float value in an NSArray?
可能的重复：
如何在 NSArray 中存储浮点值？
it wants id value but my variable is float. and i want to import tmpValue array 1. object. How Can i do this?
它需要 id 值，但我的变量是浮点数。我想导入 tmpValue 数组 1. 对象。我怎样才能做到这一点？
tmpToplam = tmpToplam + ([[self.closeData objectAtIndex:i]floatValue] - tmpToplam)* expCarpan;
[tmpValue replaceObjectAtIndex:1 withObject:tmpToplam];
回答by Marko
You probably want to wrap your floats in NSNumber, as id is just a pointer to "any Objective-C object" and NSNumber is the appropriate Object-C class to wrap numbers:
你可能想把你的浮点数包裹在 NSNumber 中，因为 id 只是一个指向“任何 Objective-C 对象”的指针，而 NSNumber 是合适的 Object-C 类来包裹数字：
float a = 2.0;
float b = 3.0;
NSNumber *aNumber = [NSNumber numberWithFloat:a];
NSNumber *bNumber = [NSNumber numberWithFloat:b];
NSArray *array = [NSArray arrayWithObjects:aNumber, bNumber, nil];
回答by jbat100
idis a pointer to an objective c object, in the case of cocoa generally an NSObject, so you need to wrap your float in an NSNumber(which inherits from NSObject). NSNumbercan handle many other primitive types.
id是指向目标 c 对象的指针，在可可的情况下通常是 an NSObject，因此您需要将浮点数包装在 an NSNumber（继承自NSObject）中。NSNumber可以处理许多其他原始类型。
回答by utsabiem
Why don't you convert tmpToplam into string using NSString StringWithFormat ? Actually in an array, you need to put an object and float is not considered object. String is, of course, an object.
为什么不使用 NSString StringWithFormat 将 tmpToplam 转换为字符串？实际上在数组中，您需要放置一个对象，而 float 不被视为对象。字符串当然是一个对象。
