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iOS - @property与@synthesize与@dyn

2018-01-02  本文已影响64人  SkyMing一C
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@property

存取器(accessor):指用于获取和设置实例变量的方法。用于获取实例变量值的存取器是getter,用于设置实例变量值的存取器是setter。

创建存取器

1. 使用get/set方法创建存取器
//  Man.h
#import <Foundation/Foundation.h>

@interface Man : NSObject
{
    // 实例变量
    NSString *name;
    NSString *sex;
}
// setter
- (void)setName:(NSString *)newName;

// getter
- (NSString *)name;

// setter
- (void)setSex:(NSString *)newSex;

// getter
- (NSString *)sex;
@end
//  Man.m
#import "Man.h"

@implementation Man
// setter
- (void)setName:(NSString *)newName
{
    name = newName;
}

// getter
- (NSString *)name
{
    return name;
}

// setter
- (void)setSex:(NSString *)newSex
{
    sex = newSex;
}

// getter
- (NSString *)sex
{
    return sex;
}
@end
    Man *man = [[Man alloc] init];
    [man setName:@"Jeep Cherokee"];
    [man setSex:@"男"];
    NSLog(@"The man name is %@ and the Sex is %@",[man name],[man sex]);

2. 使用@Property创建存取器
//  Man.h
#import <Foundation/Foundation.h>

@interface Man : NSObject
@property (nonatomic,strong)NSString *name;
@property (nonatomic,strong)NSString *sex;
@end
//  Man.m
#import "Man.h"

@implementation Man
@synthesize name = _name;
@synthesize sex = _sex;
// setter
- (void)setName:(NSString *)name
{
    _name = name;
}

// getter
- (NSString *)name
{
    return _name;
}

// setter
- (void)setSex:(NSString *)sex
{
    _sex = sex;
}

// getter
- (NSString *)sex
{
    return _sex;
}
@end

@property的特性

1. 原子性
2. 存取器控制
@property (nonatomic, setter = mySetter,getter = myGetter ) NSString *name;

@property (nonatomic,getter = isHidden ) BOOL hidden;
3. 内存管理

@synthesize

//  Man.m
#import "Man.h"

@implementation Man
@synthesize name = _name;
@synthesize sex = _sex;
// setter
- (void)setName:(NSString *)name
{
    _name = name;
}

// getter
- (NSString *)name
{
    return _name;
}

// setter
- (void)setSex:(NSString *)sex
{
    _sex = sex;
}

// getter
- (NSString *)sex
{
    return _sex;
}
@end

@dynamic

//  Man.h
#import <Foundation/Foundation.h>

@interface Man : NSObject
@property (nonatomic,strong)NSString *name;
@property (nonatomic,strong)NSString *sex;
@end
//  Man.m
#import "Man.h"

@implementation Man
@dynamic name, sex;
@end

参考

@property 和 @synthesize

Objective-C中的@property

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