enumerateObjectsUsingBlock代码块用法

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//对数组中元素块操作
    NSArray* array = @[@"aa",@"bb",@"cc",@"dd",@"ee",@"ff",@"gg"];
    [array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        NSLog(@"%@",obj);
    }];
    NSLog(@"-------------- ");
    //NSIndexSex 是取值范围  options为NSEnumerationReverse倒序，NSEnumerationConcurrent正序
    [array enumerateObjectsAtIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(1, 4)] options:NSEnumerationReverse usingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        NSLog(@"%@",obj);
    }];
    NSLog(@"-----enumerateObjectsUsingBlock--------- ");
    _textfield1 = [[UITextField alloc]init];
    _textfield2 = [[UITextField alloc]init];
    _textfield3 = [[UITextField alloc]init];
    _textfield4 = [[UITextField alloc]init];
    _textfield5 = [[UITextField alloc]init];
    _textfield6 = [[UITextField alloc]init];
    NSArray* textfieldArray = @[_textfield1,_textfield2,_textfield3,_textfield4,_textfield5,_textfield6];
    //可以利用此方法进行控件批量处理，不过不能进行创建处理，因为Array会报插入null元素的错。
    [textfieldArray enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        UITextField* textfield = obj;
        NSLog(@"%i",idx);
        textfield.tag = idx;
        textfield.text = [array objectAtIndex:idx];
        NSLog(@"%@",textfield.text);
        textfield.delegate = self;
    }];
    NSLog(@"text3 : %@",_textfield3.text);
    NSLog(@"-------indexOfObjectPassingTest------- ");
    //可以处理自己想要的元素，参数方法同上类似
    NSInteger index = [textfieldArray indexOfObjectPassingTest:^BOOL(id obj, NSUInteger idx, BOOL *stop) {
        UITextField* textfield = (UITextField*)obj;
        NSLog(@"%i",textfield.tag);
        NSLog(@"%@",textfield.text);
        if([textfield.text isEqualToString:@"cc"]){
            return YES;
        }
        return NO;
    }];
    NSLog(@"%i
------------------------",index);