前言
在开发IOS中常常需要用到这一功能，在限定一个月的时间间隔为第一天和最后一天，需要知道这个月有多少天，才能知道最后一天是多少号，而且还要知道是否是闰年，可能2月只有28天。
话不多说，附上代码：
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- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
NSLog(@"%ld",(long)[self howManyDaysInThisYear:2016 withMonth:1]);
NSLog(@"%ld",(long)[self howManyDaysInThisYear:2016 withMonth:2]);
NSLog(@"%ld",(long)[self howManyDaysInThisYear:2016 withMonth:3]);
NSLog(@"%ld",(long)[self howManyDaysInThisYear:2016 withMonth:4]);
NSLog(@"%ld",(long)[self howManyDaysInThisYear:2016 withMonth:5]);
NSLog(@"%ld",(long)[self howManyDaysInThisYear:2016 withMonth:6]);
NSLog(@"%ld",(long)[self howManyDaysInThisYear:2016 withMonth:7]);
NSLog(@"%ld",(long)[self howManyDaysInThisYear:2016 withMonth:8]);
}
#pragma mark - 获取某年某月的天数
- (NSInteger)howManyDaysInThisYear:(NSInteger)year withMonth:(NSInteger)month{
if((month == 1) || (month == 3) || (month == 5) || (month == 7) || (month == 8) || (month == 10) || (month == 12))
return 31 ;
if((month == 4) || (month == 6) || (month == 9) || (month == 11))
return 30;
if((year % 4 == 1) || (year % 4 == 2) || (year % 4 == 3))
{
return 28;
}
if(year % 400 == 0)
return 29;
if(year % 100 == 0)
return 28;
return 29;
}
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