respondsToSelector instancesRespondToSelector
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要检查一个对象是否支持一个方法,我们可以使用respondsToSelector()函数
除了检查对象是否支持一个特定的方法,我们还可以检查类是否会创建支持一个特定的方法的对象。未来做到这一点,我们使用instancesRespondToSelector()方法
举例:
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#import <Foundation/Foundation.h>
#import <stdio.h>
@interface Class1 : NSObject
{
}
-(void)print;
@end
@implementation Class1
-(void)print
{
printf("This is Class 1.\n");
}
@end
int main (int argc, const char * argv[]) {
Class1 *c1=[Class1 new];
//验证对象支持一个方法
if ([c1 respondsToSelector: @selector(print)]==YES) {
printf("c1 has a print method. \n");
}
//验证类是否创建支持一个特定方法的对象
if ([Class1 instancesRespondToSelector: @selector(print)]==YES) {
printf("Class1 object have a print method \n\n");
}
return 0;
}
输出结果:
c1 has a print method.
Class1 object have a print method
0 0
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