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一，代码。

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    NSLog(@"8月的天数%ld",(long)[self getCurrentDay:8]);
    
}
#pragma -mark -functions
//获得当前的月的天数
-(NSInteger )getCurrentDay:(int) currentMonth{
    if (currentMonth < 8 ) {
        if (currentMonth %2 ==1) {
            return 31;
        }else{
            return 30;
        }
    }else{
        if (currentMonth %2 ==1) {
            return 30;
        }else{
            return 31;
        }
    }
    
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

 

二，输出。

2015-10-19 13:33:04.785 获得当前的月的天数[5116:115173] 8月的天数31