CACalendarView

CacalendarView allow to display calendar within the app with flat and and custom UI. A custom caledar can be display with ew lines of code. Download CACalendarViewSample and add CACalendarView to project. Add below code for display CACalendarView

CGSize size = [UIScreen mainScreen].bounds.size;
CACalendarView *calendarView = [[CACalendarView alloc] initWithFrame:CGRectMake(0, 70, size.width, size.height-200)];
calendarView.backgroundColor  = [UIColor whiteColor];
//set delegate
calendarView.delegate = self;
[self.view insertSubview:calendarView atIndex:0];

Implement CACalendarDelegate for get selected date
-(void) didSelectedDate:(NSDate *)date{
    //date format 2017-09-13
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
      [formatter setDateFormat:@"yyyy-MM-dd"];
  NSLog(@"selected date = %@  and string = %@", date, [formatter stringFromDate:date]);
}

run the application, you can see CACalendarView

if you want to disable selection of previous dates just add a line of code

calendarView.isDisablePreviousDate = true; 

you can also set date on calendar by using below code

[calendarView setSetectedDate:[NSDate date]];