一个简单下拉弹出式索引效果

该源码是一个简单下拉弹出式索引效果，源码MagnetPopupPicker，简单的下拉弹出式索引, 可用于搜索或者数据输入, 默认DEMO界面不能适应IOS8 只能适应7.0.在IOS8下会变型, 需要自己调整用法。 使用方法： 导入文件 #import "PopupPickerButton.h" #import "KeyValuePair.h" //新建BUTTON用于显示 self.button = [[PopupPickerButton alloc] initWithFrame:CGRectMake(11, 50, 150, 30)]; self.button.backgroundColor = [UIColor darkGrayColor]; [self.button setTitle:@"Select" forState:UIControlStateNormal]; NSArray *list = [NSArray arrayWithObjects:[KeyValuePair keyValuePairWithKeyAndValue:@"test1" value:@"Test 1"], [KeyValuePair keyValuePairWithKeyAndValue:@"test2" value:@"Test 2"], [KeyValuePair keyValuePairWithKeyAndValue:@"test3" value:@"Test 3"], nil]; //button 类型为 PopupPickerButton 传入数据进行设置 [self.button setOptions:list keyNames:[KeyValuePair keyValuePairWithKeyAndValue:@"key" value:@"value"]]; [self.view addSubview:self.button];