iOS开发 关于SEL的简单总结

#import <Foundation/Foundation.h>

@interface Person : NSObject

- (void)test1;

- (void)test2:(NSString *)str;

@end

#import "Person.h"

@implementation Person

- (void)test1
{
    NSLog(@"无参数的对象方法");
}

- (void)test2:(NSString *)str
{
    NSLog(@"带有参数的方法%@",str); 
}

@end

#import <Foundation/Foundation.h>

#import "Person.h"

int main(int argc, const char * argv[])
{

    @autoreleasepool {
        
        Person *p=[[Person alloc] init];
        
        [p test1];
        
        
        [p performSelector:@selector(test1)];
        
        [p performSelector:@selector(test2:) withObject:@"hello"];
        
        
    }
    return 0;
}

SEL s1 = @selector(test1); // 将test1方法包装成SEL对象　 
SEL s2 = NSSelectorFromString(@"test1"); // 将一个字符串方法转换成为SEL对象