Objective-C 中是否可以将 -init 方法设为私有

在Objective-C中，我们可以将-init方法设为私有。Objective-C是一种面向对象的编程语言，它允许我们创建对象并通过调用初始化方法来设置对象的初始状态。通常情况下，我们会将初始化方法声明为公有方法，以便其他类可以通过该方法来实例化对象。然而，有时我们希望将初始化方法设为私有，以防止其他类直接调用该方法。

objective-c
// MyClass.h
@interface MyClass : NSObject
- (instancetype)initWithName:(NSString *)name;
@end
// MyClass.m
@interface MyClass ()
- (instancetype)initWithName:(NSString *)name;
@end
@implementation MyClass
- (instancetype)initWithName:(NSString *)name {
    self = [super init];
    if (self) {
        _name = name;
    }
    return self;
}
- (instancetype)init {
    // 私有初始化方法，外部不可见
    return [self initWithName:@"Default"];
}
@end

objective-c
// Car.h
@interface Car : NSObject
@property (nonatomic, strong) NSString *make;
@property (nonatomic, strong) NSString *model;
+ (instancetype)carWithMake:(NSString *)make model:(NSString *)model;
@end
// Car.m
@interface Car ()
- (instancetype)initWithMake:(NSString *)make model:(NSString *)model;
@end
@implementation Car
- (instancetype)initWithMake:(NSString *)make model:(NSString *)model {
    self = [super init];
    if (self) {
        _make = make;
        _model = model;
    }
    return self;
}
+ (instancetype)carWithMake:(NSString *)make model:(NSString *)model {
    return [[self alloc] initWithMake:make model:model];
}
@end