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  • block语法排序 遍历

    block语法排序:

     NSMutableArray* array = [NSMutableArray arrayWithObjects:@"6",@"34",@"56",@"78",nil];
            NSComparator sortBlock =^(id obj1,id obj2)
            {
                int object1 = [obj1 intValue];
                int object2 = [obj2 intValue];
                if(object1<object2)
                {
                    return NSOrderedDescending;
                }
                else if (object1==object2)
                {
                    return NSOrderedSame;
                }
                else
                {
                    return NSOrderedAscending;
                }
            };
            NSArray* sortArray = [array sortedArrayUsingComparator:sortBlock];
            NSLog(@"%@",sortArray);
        }
        return 0;
    }

    block语法遍历:

     NSArray* array = @[@"one",@"two",@"three"];
            //下标遍历
            for(int i=0;i<[array count];i++)
            {
                id obj = [array objectAtIndex:i];
                NSLog(@"%@",obj);
            }
            //for in语法
            for(id obj in array)
            {
                NSLog(@"%@",obj);
            }
            //枚举器
            NSString* str = nil;
            NSEnumerator* enumerator  = [array objectEnumerator];
            while (str = [enumerator nextObject])
            {
                NSLog(@"%@",str);
            }
            //block语法
            [array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
                NSLog(@"idx=%ld obj=%@",idx,obj);
            }];
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  • 原文地址:https://www.cnblogs.com/hezhuangzhuang/p/5112055.html
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