IOS_Block_使用

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        
        //first
        void (^myBlock)() = ^{
            NSLog(@"myBlock execute");
        };
        myBlock();
        
        //second return value
        int (^sum)(int, int) = ^int(int x, int y){
            return x+y;
        };
        NSLog(@"sum = %d", sum(2, 6));
        
        //third
        Calc *c = [[Calc alloc] init];
        NSLog(@"s = %d", [c calcNum1:10 withNum2:20 andCalcWith:sum]);

        NSLog(@"value = %d", [c calcNum1:10 withNum2:30 andCalcWith:^int(int x, int y) {
            return x*y;
        }]);
        
    }
    return 0;
}int main(int argc, const char * argv[]) {
    @aut