從NSMutableArray獲取最大值

-5

如何從NSMutableArray獲取最大值。值是作爲存儲在NSString的陣列如下面從NSMutableArray獲取最大值

for(int counter=0; counter<[datesArray count];counter++) 
{ 
    glass = [NSString stringWithFormat:@"%f",[[dbhandler todayData:currentDate] floatValue]]; 
    [graphGlassesArray addObject:glass]; 
}

陣列名稱是graphGlassesArray。

來源

2014-10-01 Muhammad Zeeshan Anwar

您是否嘗試循環並將迄今爲止遇到的最大值存儲在變量中？ – APerson 2014-10-01 12:56:16

嘗試可以使用從陣列獲取最大價值：通過排序可變數組

NSSortDescriptor *desc = [[NSSortDescriptor alloc] initWithKey:nil ascending:NO selector:@selector(localizedCompare:)]; 
NSString *maxValue = [[graphGlassesArray sortedArrayUsingDescriptors:[NSArray arrayWithObject:desc]] objectAtIndex:0]; 
[desc release];

來源

2014-10-01 13:01:37 nicopasso

你只比我快了一秒......我並沒有發佈這個想法。 – holex 2014-10-01 13:02:31

float max = 0.f; 
for(int counter=0; counter<[datesArray count];counter++) 
{ 
    glass = [NSString stringWithFormat:@"%f",[[dbhandler todayData:currentDate] floatValue]]; 
    [graphGlassesArray addObject:glass]; 
    if(max < [[dbhandler todayData:currentDate] floatValue]) { 
     max = [[dbhandler todayData:currentDate] floatValue]; 
    } 
}

與此

來源

2014-10-01 12:59:09

嘗試使用鍵值編碼（https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/KeyValueCoding/Articles/CollectionOperators.html）。爲了克服NSArray中的最大值，你可以做[array valueForKeyPath:@"@max.attribute"]。試着看看這個鏈接http://nshipster.com/kvc-collection-operators/。

來源

2014-10-01 13:02:21

你也應該儘量

NSNumber* max = [graphGlassesArray valueForKeyPath:@"max.self"]; 
float maxFloat = [max floatValue]

來源

2014-10-01 13:02:28 Pablosproject

從NSMutableArray獲取最大值

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