iOS 获取当前月份一共多少天

//获取当月的总天数

NSCalendar *calendar = [NSCalendar currentCalendar];

NSRange range = [calendar rangeOfUnit:NSDayCalendarUnit inUnit:NSMonthCalendarUnit forDate:[NSDate date]];

NSUInteger numberOfDaysInMonth = range.length;

NSLog(@"%lu", (unsigned long)numberOfDaysInMonth);