enumerateObjectsUsingBlock代码块用法

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新QQ交流群：418536818，之前的群已满//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\n------------------------",index);
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