The Most Simple Date picker.最简单的时间选择器 调用方法：
#import "UICustomDatePicker.h"
__weak ViewController *vc = self;
[UICustomDatePicker showCustomDatePickerAtView:self.view choosedDateBlock:^(NSDate *date) {
__strong ViewController *ss = vc;
NSLog(@"current Date:%@",date);
} cancelBlock:^{
}];