Question

I asked a similar question to this already, but I still can t see the problem?

-(id)initWithKeyPadType: (int)value
{
    [self setKeyPadType:value];
    self = [self init];
    if( self != nil )
    {
        //self.intKeyPadType = value;

    }
    return self;
}

- (id)init {

    NSNumberFormatter *formatter = [[[NSNumberFormatter alloc] init] 
                                                              autorelease];
    decimalSymbol = [formatter decimalSeparator];
....

The warning comes from the line above Instance variable used while self is not set to the result of [(super or self) init...]

Answer 1

What you are trying to do is technically OK, but at some stage you need to invoke [super init]. If your class s init method does a lot of common initialisation that other initWith... methods utilise, then put your [super init] in there. Also, always make sure that the class has been init d before trying to play around with instance variables.

- (id) initWithKeyPadType: (int)value
{
    self = [self init]; // invoke common initialisation
    if( self != nil )
    {
        [self setKeyPadType:value];
    }
    return self;
}

- (id) init
{
    self = [super init]; // invoke NSObject initialisation (or whoever superclass is)
    if (!self) return nil;

    NSNumberFormatter *formatter = [[[NSNumberFormatter alloc] init] 
                                                          autorelease];
    decimalSymbol = [formatter decimalSeparator];

    ...

Answer 2

警告意味着它所说的话。您正在将一些东西分配到decimalSymbol上,这是一个实例变量,但此时此刻,there不是。你们需要

self = [super init];

在开始采用您的内心方法时。在某些时候,必须制造该物体,在某个时候,这必须回到国家统计局的目标(通过超级 in链)。

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