Finding maximum numeric value in NSArray

问题

I have an NSArray of NSNumbers and want to find the maximum value in the array. Is there any built in functionality for doing so? I am using iOS4 GM if that makes any difference.

回答1:

The KVC approach looks like this:

int max = [[numbers valueForKeyPath:@"@max.intValue"] intValue];

or

NSNumber * max = [numbers valueForKeyPath:@"@max.intValue"];

with numbers as an NSArray

回答2:

NSArray *  test= @[@3, @67, @23, @67, @67];
int maximumValue = [[test valueForKeyPath: @"@max.self"] intValue];
 NSLog(@" MaximumValue = %d", maximumValue);

// Maximum = 67

回答3:

Here is the swift version

let maxValue =  (numbers.value(forKeyPath: "@max.self") as! Double)

回答4:

Hope will helpful to you.

NSArray *  arrayOfBarGraphValues = @[@65, @45, @47 ,@87 , @46, @66  ,@77  ,@47  ,@79  ,@78  ,@87  ,@78  ,@87 ];
int maxOfBarGraphValues = [[arrayOfBarGraphValues valueForKeyPath: @"@max.self"] intValue];
NSLog(@" MaximumValue Of BarGraph  = %d", maxOfBarGraphValues);

来源：https://stackoverflow.com/questions/3080540/finding-maximum-numeric-value-in-nsarray