iphone - 如何将整数值添加到 NSMutableArray？

Question

NSMutableArray * val;
val = [[NSMutableArray alloc] initWithCapacity:15];

/*int outlineWidth = barOutlineWidth;
int outlineHalfWidth = (outlineWidth > 1) ? outlineWidth * 0.5f : 0;
 */
for ( Bar * obj in values )
{  
  // calcualte the bar size
  float value  = [obj value];
  float scale  = ( value / maxValue );

  // shift the bar to the top or bottom of the render line
  int pointY   = lineHeight + ( (lineWidth * 0.5f) * ( ( value >= 0.0f ) ? -1 : 1 ) );
  int barHeight = height * scale;
  NSLog(@"%d", barHeight);   
  CGRect barRect = CGRectMake(pointX, pointY, width, -barHeight);
  [val addObject:[NSNumber numberWithInt:barHeight]];
                     NSLog(@"%d", val);

我想将 barheight (int) 添加到数组 val 中。这可能吗？在运行代码时，

session started at 2010-09-16 13:21:50 +0530.]
2010-09-16 13:21:53.791 BarGraphSample[3168:20b] 78
2010-09-16 13:21:53.797 BarGraphSample[3168:20b] 69398112
2010-09-16 13:21:53.807 BarGraphSample[3168:20b] 235
2010-09-16 13:21:53.812 BarGraphSample[3168:20b] 69398112
2010-09-16 13:21:53.813 BarGraphSample[3168:20b] 156
2010-09-16 13:21:53.814 BarGraphSample[3168:20b] 69398112

这是输出。

这里实际的条高是 78,235,156，在打印数组 val 时。

我得到像“69398112”这样的值

我该怎么办？

Answer 1

您只能将指向对象的指针添加到 NSMutableArray。如果你使用 NSNumber 类来包装你的整数，那么你应该能够将它添加到数组中。

int x = 10;
NSNumber* xWrapped = [NSNumber numberWithInt:x];
NSMutableArray* array = [[NSMutableArray alloc] initWithCapacity:15];
[array addObject:xWrapped];
int xOut = [[array lastObject] intValue]; //xOut == x;

希望这对您有所帮助。