iphone - 一次分配，retainCount == 2

Question

我有以下代码:

NSLog(@"%d", [chart retainCount]);

self.chart = [[BNPieChart alloc] initWithFrame:self.view.frame];
NSLog(@"%d", [chart retainCount]);

终端显示:

[Session started at 2011-03-28 11:09:46 +0200.]
2011-03-28 11:09:51.008 Finance[35111:207] 0

2011-03-28 11:09:51.010 Finance[35111:207] 2

据我所知，retainCount 应该等于 1，而不是 2。

Answer 1

您将图表属性定义为保留或复制，因此:

self.chart = [[BNPieChart alloc] initWithFrame:self.view.frame];

+1 在分配时保留 ([BNPieChart alloc])
+1 赋值时保留 (self.chart = )