git地址：https://github.com/JKTerry/UICustomDatePicker
最简单的时间选择器，只需一句代码搞定
使用方法：
#import "UICustomDatePicker.h"
__weak ViewController *vc = self;
[UICustomDatePicker showCustomDatePickerAtView:self.view choosedDateBlock:^(NSDate *date) {
__strong ViewController *ss = vc;
NSLog(@"current Date:%@",date);
} cancelBlock:^{

}];