私は保持解放についてより深く理解しようとしています。これが私のコードです。次に、コード実行からの出力を投稿します。「self」に対して dealloc が呼び出されたときに保持カウントがゼロにならない理由がわかりません。
次に、メモリを割り当てたときに self.testNumber の保持カウントが 2 になるのはなぜですか。代わりにテスト番号に「Weak」プロパティを使用する必要がありますか?
コード:
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
_testNumber = [[NSNumber alloc] initWithInt:10];
testNumber = [[NSNumber alloc] initWithInt:102];
_testInt = 105;
self.testNumber = [[NSNumber alloc] initWithInt:101];
NSLog(@"self.testNumber retain count = %d",[self.testNumber retainCount]);
NSLog(@"self.label retain count = %d",[self.label retainCount]);
self.label.text = [NSString stringWithFormat:@"%d %d %d",_testNumber.integerValue,self.testNumber.integerValue,testNumber.integerValue ];
NSLog(@"self before release retain count = %d",[self retainCount]);
[self release];
NSLog(@"self after release retain count = %d",[self retainCount]);
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)dealloc {
NSLog(@"_label after before retain count = %d",[_label retainCount]);
[_label release];
NSLog(@"_label after release retain count = %d",[_label retainCount]);
[super dealloc];
}
出力:
2013-04-08 15:31:28.503 propertiesTest[5561:907] self.testNumber retain count = 2
2013-04-08 15:31:28.507 propertiesTest[5561:907] self.label retain count = 3
2013-04-08 15:31:28.509 propertiesTest[5561:907] self before release retain count = 3
2013-04-08 15:31:28.510 propertiesTest[5561:907] self after release retain count = 2
2013-04-08 15:31:28.532 propertiesTest[5561:907] _label after before retain count = 3
2013-04-08 15:31:28.534 propertiesTest[5561:907] _label after release retain count = 2