相关疑难解决方法(0)

鉴于此代码:

// Initialize string
NSString *name = @"Franzi";

@""宏创建一个带有给定文本的NSString(这里名称为Franzi)和一个RETAIN COUNT OF 1？

所以@""给出了一个必须被释放的NSString？我对这个对象负责吗？第二个代码示例然后让我感到困惑,即使我这样使用它:

NSSting *message;
message = [NSString stringWithFormat:@"Hello @%!",name];
//message = [NSString stringWithFormat:@"Hello Girl!"];

因此消息在下一个运行循环中释放,k.但是作为stringWithFormat的参数给出的NSString是什么？

类对象NSString是否释放了作为争论的NSString @"Hello%@"/ @"Hello Girl"？或@"" - Konstruktor只回馈自动释放的NSStrings？

我有以下示例类:

Test.h:

@interface Test : UIButton {
    NSString *value;
}
- (id)initWithValue:(NSString *)newValue;
@property(copy) NSString *value;

Test.m:

@implementation Test
@synthesize value;
- (id)initWithValue:(NSString *)newValue {
    [super init];   
    NSLog(@"before nil value has retain count of %d", [value retainCount]);
    value = nil;
    NSLog(@"on nil value has retain count of %d", [value retainCount]);
    value = newValue;
    NSLog(@"after init value has retain count of %d", [value retainCount]);
    return self;
}

其中产生以下输出:

2008-12-31 09:31:41.755 Concentration[18604:20b] before nil value has retain count of 0
2008-12-31 09:31:41.756 …