如何对1值为dec​​而1值为float的NSArray进行排序

Question

My current project does a great deal of aggregation and one of the values I wanted to sort on is coming back in 2 flavors

1. My first source will return 0.9 / 1 / 1.1

2. My second source will return 2.349823432 / 4.93432343

My question is 2 fold

• What type should I set on my object to capture this value so sorting works correctly. I'm asking because I currently parse json and set these values manually.

• After the value is set what is the best way to sort w/ the information provided?

Thank you in advance

Answer 1

You might want to create a class to describe the values you are parsing, and define the sorting logic in that class. A simple example,

@interface MyClass : NSObject {
    NSNumber *someNum;
        NSString *someString;
...
}

@implementation MyClass

- (NSComparisonResult)compareNums:(MyClass *)myClassObject {
    return [self.someNum compare:myClassObject.someNum];
}
- (NSComparisonResult)compareStringsDescending:(MyClass *)myClassObject {
    return -1 * [self.someString compare:myClassObject.someString];
}

...

Now you can sort many myClass objects by doing this in some viewcontroller:

NSArray *mySortedArray = [self.myOriginalArray sortedArrayUsingSelector:@selector(compareNums:)];

Hope this helps

Answer 2

sortedArray = [array sortedArrayUsingSelector:@selector(compare:)];

假设您在数组中有NSNumber ，而不是诸如NSValue东西