Basic Knowledge 3

How do I set the rotation point in quartz?

12	UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bg.png"]]; imageView.layer.anchorPoint = CGPointMake(0.5, 1.0);

This is to set the rotation point to the bottom middle. Remember to be supported in Quartzcore.framework.

Create a. plist file and store it?

123456789101112131415161718

NSString *errorDesc;  //用来存放错误信息 NSMutableDictionary *rootObj = [NSMutableDictionary dictionaryWithCapacity:4]; //NSDictionary, NSData等文件可以直接转化为plist文件 NSDictionary *innerDict; NSString *name; Player *player; NSInteger saveIndex; for(int i = 0; i < [playerArray count]; i++) {       player = nil;       player = [playerArray objectAtIndex:i];       if(player == nil)              break;       name = player.playerName;// This “Player1″ denotes the player name could also be the computer name       innerDict = [self getAllNodeInfoToDictionary:player];       [rootObj setObject:innerDict forKey:name]; // This “Player1″ denotes the person who start this game } player = nil; NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:(id)rootObj format:NSPropertyListXMLFormat_v1_0 errorDescription:&errorDesc];

The last 2 lines can be ignored, just add a little bit of content to rootobj. This plistdata to create a good plist file, with its WriteToFile method can be written as a file. Here's the code:

?

1234567891011121314151617

/*得到移动设备上的文件存放位置*/        NSString *documentsPath = [self getDocumentsDirectory];         NSString *savePath = [documentsPath stringByAppendingPathComponent:@"save.plist"];          /*存文件*/        if (plistData) {                 [plistData writeToFile:savePath atomically:YES];          }          else {                 NSLog(errorDesc);                 [errorDesc release];         }          - (NSString *)getDocumentsDirectory {                 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);                 return [paths objectAtIndex:0];         }

Read the plist file and convert it to nsdictionary?

123	NSString *documentsPath = [self getDocumentsDirectory]; NSString *fullPath = [documentsPath stringByAppendingPathComponent:@"save.plist"]; NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:fullPath];

Read a generic document file?

1234567891011121314151617

NSString *tmp; NSArray *lines; /*将文件转化为一行一行的*/lines = [[NSString    stringWithContentsOfFile:@"testFileReadLines.txt"]                componentsSeparatedByString:@”\n”];  NSEnumerator *nse = [lines objectEnumerator];  // 读取<>里的内容  while(tmp = [nse nextObject]) {           NSString *stringBetweenBrackets = nil;           NSScanner *scanner = [NSScanner scannerWithString:tmp];           [scanner scanUpToString:@"<" intoString:nil];           [scanner scanString:@"<" intoString:nil];           [scanner scanUpToString:@">" intoString:&stringBetweenBrackets];           NSLog([stringBetweenBrackets description]);   }

For read-write files, there are additional, temporarily to this. Random numbers and file reads and writes are often used in game development. So put part of the content here, in order to share with you, also when the record, easy to find.

Hide Navigationbar?

1	[self.navigationController setNavigationBarHidden:YES animated:YES];

You can use it in a viewcontroller that you want to hide.

Basic Knowledge 3