取多个值当中的最大值或最小值函数

+ (CGFloat) Math_max:(id)firstObject, ...;

{

id eachObject;

va_list argumentList; 

CGFloat max = [firstObject floatValue];

if (firstObject)                     

{                                

va_start(argumentList, firstObject);          // Start scanning for arguments after firstObject.

        eachObject = va_arg(argumentList, id);

while (eachObject) // As many times as we can get an argument of type "id"

{

            if ([eachObject floatValue]>max) {

max = [eachObject floatValue];

}

            eachObject = va_arg(argumentList, id);

        }

va_end(argumentList);

}

return max;

}

+ (CGFloat) Math_min:(id)firstObject, ...;

{

id eachObject;

va_list argumentList; 

CGFloat min = [firstObject floatValue];

if (firstObject)                     

{                                

va_start(argumentList, firstObject);          // Start scanning for arguments after firstObject.

        eachObject = va_arg(argumentList, id);

while (eachObject) // As many times as we can get an argument of type "id"

{

            if ([eachObject floatValue]

min = [eachObject floatValue];

}

            eachObject = va_arg(argumentList, id);

        }

va_end(argumentList);

}

return min;

}

用法

maxHighPrice = [NPUtils Math_max:[NSNumber numberWithFloat:maxHighPrice],

[kline objectAtIndex:2],

[arrayMainIndicator objectAtIndex:1],

[arrayMainIndicator objectAtIndex:2],

[arrayMainIndicator objectAtIndex:3],

[arrayMainIndicator objectAtIndex:4],

nil];