型変換

// NSNumber->int
int i = [number intValue];
 
// NSString->int
int val = [@"123" intValue];
 
// NSBOOL->NSNumber
NSNumber *number = [[NSNumber alloc] initWithBool:YES];
 
// int->NSNumber
NSNumber *number = [[NSNumber alloc] initWithInt:1];
 
// float->NSNumber
NSNumber *number = [[NSNumber alloc] initWithfloat:1.1];
 
// Double->NSNumber
NSNumber *number = [[NSNumber alloc] initWithDouble:1.23456789];
 
// NSNumber->NSBOOL
BOOL bool = [number boolValue];
 
// NSNumber->float
float f = [number floatValue];
 
// NSNumber->Double
double d = [number doubleValue];
 
// NSNumber->NSString
NSString *str = [number stringValue];