objective-c – Obj-C,’self’未设置为'[(super或self)init …]的结果时使用的实例变量

‘self’时使用的实例变量未设置为'[(super或self)init …]的结果

一个

- (id)initWithCoder:(NSCoder *)decoder {
  if (![super init]) return nil;
  red = [decoder decodeFloatForKey:kRedKey];  //occurs here
  green = [decoder decodeFloatForKey:kGreenKey];
  blue = [decoder decodeFloatForKey:kBlueKey];
  return self;
}

乙

- (id)initWithFrame:(CGRect)frame title:(NSString*)str sideUp:(BOOL)up{

    if(![super initWithFrame:frame]) return nil;

    int y;
    UIImage *img;

    if(up){
        img = [UIImage imagenamedTK:@"TapkuLibrary.bundle/Images/graph/popup"];
        y = 5;
    }else{
        img = [UIImage imagenamedTK:@"TapkuLibrary.bundle/Images/graph/popdown"];
        y = 14;
    }

    BACkground = [[UIImageView alloc] initWithImage:img]; // occurs here

C

- (id) initWithFrame:(CGRect)frame {
    if(![super initWithFrame:frame]) return nil;

    UILabel *titleBACkground = [[[UILabel alloc] initWithFrame:
            CGRectMake(0,480,40)] autorelease];
    titleBACkground.BACkgroundColor = [UIColor whiteColor];
    [self addSubview@R_139_6964@BACkground];

    titleLabel = [[UILabel alloc] initWithFrame:CGRectZero]; // occurs here

对于块A,这是正确的

self = [self init]; 
if( self != nil )
{

和B& C

- (id) initWithFrame:(CGRect)frame {
   super = [super initWithFrame:frame]
    if(super != nil)
   {