一些也许会用到的oc知识

一、oc如何将数据写入到plist文件中

/**
*数组、字典只能将Bool、NSNumber、NSString、NSData、NSDate、NSArray、NSDictionary 写入属性列表plist文件
*/

    NSValue *value = [NSValue valueWithRange:NSMakeRange(1, 5)];
    NSDictionary *dic = @{@"key1":@12345,@"key2":@"tttxxx",@"key3":value};
    NSString *homePath = NSHomeDirectory();
    NSString *path = [homePath stringByAppendingPathComponent:@"t.plist"];
    BOOL success = [dic writeToFile:path atomically:YES];
    if (success) {
        NSLog(@"write success");
    }

二、拆分路径

NSString *path = @"/Users/apple/testfile.text";
NSArray *pathComps = [path pathComponents];
NSLog(@"%@",pathComps);

屏幕快照 2016-05-26 下午2.12.51.png

三、计算一个目录的容量大小

NSString *directPath = [homePath stringByAppendingPathComponent:@"test"];
NSDirectoryEnumerator *files = [fileManager enumeratorAtPath:directPath];

NSString *path = [files nextObject];
NSInteger fileNum = 0;
while (path != nil) {
    NSLog(@"%@",path);
    NSString *path2 = [directPath stringByAppendingPathComponent:path];
    NSDictionary *attrDic = [fileManager attributesOfItemAtPath:path2 error:nil];
    NSNumber *fileSize = attrDic[NSFileSize];
    fileNum += [fileSize intValue];
    
    path = [files nextObject];
}
NSLog(@"目录的总大小：%d",fileNum);

四、获取对应的时区时间

    NSDateFormatter * dateFormatter = [[NSDateFormatter alloc]init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd"];
    NSDate *date = [NSDate date];
    NSTimeZone *zone = [NSTimeZone systemTimeZone];
    NSInteger interval = [zone secondsFromGMTForDate: date];
    NSDate *localeDate = [NSDate dateWithTimeInterval:interval sinceDate:date];
    NSString * s =  [dateFormatter stringFromDate:localeDate];

五、取消延迟执行的函数

延迟执行函数

[self performSelector:@selector(scrollDone) withObject:nil afterDelay:0.5];

在0.5秒内取消执行函数，带的参数必须一样，才能取消成功

[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(scrollDone) object:nil];