IOS_Block_使用，ios_block使用

IOS_Block_使用，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;}

////  Calc.h//#import <Foundation/Foundation.h>typedef int (^calcBlock)(int, int);@interface Calc : NSObject-(int) calcNum1:(int)num1 withNum2:(int)num2 andCalcWith:(calcBlock)calc;@end

////  Calc.m//#import "Calc.h"@implementation Calc- (int)calcNum1:(int)num1 withNum2:(int)num2 andCalcWith:(calcBlock)calc{    return calc(num1, num2);}@end