iOS 动态加载类方法 实例方法

工作中生成的静态库程序中为了避免必须要导入头文件，很多时候需要动态加载，减少导入头文件的累赘，动态加载类方法和动态加载实例方法成了必然。

@interface Person : NSObject

+(void)personClick;

+(void)personClickWithSingSong:(NSString*)singSong;
+(void)eatAnimal:(NSString*)animal andHongShao:(NSString*)hongShao andYundong:(NSString*)yundong;

+ (instancetype)sharePersonManager;



-(void)haveFlowerWithWhite:(NSString*)white andRed:(NSString*)red andOrange:(NSString*)orange;

@end

+(void)eatAnimal:(NSString*)animal andHongShao:(NSString*)hongShao andYundong:(NSString*)yundong
{
    NSLog(@"吃小动物%@==%@==%@",animal,hongShao,yundong);
}

-(void)haveFlowerWithWhite:(NSString*)white andRed:(NSString*)red andOrange:(NSString*)orange
{
    NSLog(@"实例方法==%@==%@==%@",white,red,orange);
}

+(void)personClick
{
    NSLog(@"类方法");
}

+(void)personClickWithSingSong:(NSString*)singSong
{
    NSLog(@"类方法有一个参数的%@",singSong);

}



static id personManager = nil;

+ (instancetype)sharePersonManager {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        if(personManager == nil){
            personManager = [[self alloc] init];
        }
    });
    return personManager;
}

-(void)eatWahaha
{
    NSLog(@"喝娃哈哈");
}

以下调用方式
1.无参数或者参数少于两个（用这种相对方便）

//无参数的情况
Class personClass = NSClassFromString(@"Person");
  [[personClass class]  performSelector:@selector(personClick)];

//有一个参数
Class personClass = NSClassFromString(@"Person");
    
[[personClass class]  performSelector:@selector(personClickWithSingSong:) withObject:@"云与海"];

2021-06-07 14:40:30.248390+0800 RuntimeDemo[6126:547111] 类方法有一个参数的云与海

2.两个参数以上（动态调用类方法 || 动态调用实例方法）

//动态调用类方法
Class personClass = NSClassFromString(@"Person");
        NSString *strA = @"字符串objc_msgSend";
        NSString *strB = @"字符串objc_msgSend";
    
        NSString *strC = @"字符串objc_msgSend";
    
        SEL selggg = NSSelectorFromString(@"eatAnimal:andHongShao:andYundong:");
        ((void (*) (id, SEL, NSString *, NSString *, NSString *)) objc_msgSend) (personClass, selggg, strA, strB, strC);

2021-06-07 14:43:35.524104+0800 RuntimeDemo[6145:548656] 吃小动物字符串objc_msgSend==字符串objc_msgSend==字符串objc_msgSend


//动态调用实例方法
Class personClass = NSClassFromString(@"Person");
        NSString *strA = @"字符串objc_msgSend";
        NSString *strB = @"字符串objc_msgSend";
    
        NSString *strC = @"字符串objc_msgSend";
    
        SEL selggg = NSSelectorFromString(@"haveFlowerWithWhite:andRed:andOrange:");
        ((void (*) (id, SEL, NSString *, NSString *, NSString *)) objc_msgSend) ([personClass performSelector:@selector(sharePersonManager)], selggg, strA, strB, strC);
    
2021-06-07 14:47:35.530893+0800 RuntimeDemo[6170:551003] 实例方法==字符串objc_msgSend==字符串objc_msgSend==字符串objc_msgSend


/*************************第二种方式**************************/


//也可以NSObject写个分类

Class personClass = NSClassFromString(@"Person");
        NSString *strA = @"字符串objc_msgSend";
        NSString *strB = @"字符串objc_msgSend";
        NSString *strC = @"字符串objc_msgSend";
    [[personClass performSelector:@selector(sharePersonManager)] performSelector:@selector(haveFlowerWithWhite:andRed:andOrange:) withObjects:@[strA,strB,strC]];

分类下载地址
链接: https://pan.baidu.com/s/1qXk6JY7hN8wWJZqONUEqHA 密码: dn1s