Objective－C 选择排序

NSMutableArray *sourceArray = [NSMutableArray arrayWithObjects:@(3), @(5), @(7), @(9), @(2), @(4), @(8), @(6), nil];

//选择排序

for (int i = 0; i < sourceArray.count - 1; i++)

{

for (int j = i+1; j < sourceArray.count; j++)

{

NSInteger baseIdx = i;

NSInteger moveIdx = j;

NSNumber* baseNum = [sourceArray objectAtIndex:baseIdx];

NSNumber* moveNum = [sourceArray objectAtIndex:moveIdx];

if (baseNum.intValue > moveNum.intValue)

{

[sourceArray exchangeObjectAtIndex:baseIdx withObjectAtIndex:moveIdx];

}

}

}

　　//验证结果

[sourceArray enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {

NSLog(@"%d:%@", idx, obj);

}];