//1.获取沙盒数据容器根目录
NSString *homePath = NSHomeDirectory();
NSLog(@"home根目录:%@", homePath);
//2.获取Documents路径
/*参数一：指定要搜索的文件夹枚举值
参数二：指定搜索的域Domian: NSUserDomainMask
参数三：是否需要绝对/全路径：NO：波浪线~标识数据容器的根目录; YES(一般制定): 全路径
*/
NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
NSLog(@"documens路径:%@", documentPath);
//3.获取Library路径
NSString *libraryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) lastObject];
NSLog(@"libaray路径:%@", libraryPath);
//4.获取tmp路径
NSString *tmpPath = NSTemporaryDirectory();
NSLog(@"tmp路径：%@", tmpPath);
另一种方法
NSString *documents = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
//拼接文件绝对路径
NSString *path = [documents stringByAppendingPathComponent:@"header.png"];
