将NSObject转换为NSString

NSObject *object = ...; // 需要转换的 NSObject 对象
NSString *string = [object description];

NSNumber *number = ...; // 需要转换的数字对象
NSString *string = [NSString stringWithFormat:@"%@", number];

@interface CustomObject : NSObject
@property (nonatomic, strong) NSString *name;
@property (nonatomic, assign) NSInteger age;
@end

@implementation CustomObject
- (NSString *)description {
    return [NSString stringWithFormat:@"<CustomObject: %@, %ld>", self.name, (long)self.age];
}
@end