如何学习iPhone之开发过程中的一些小技术的总结.pptxVIP

如何学习iPhone之开发过程中的一些小技术的总结;????????头文件的引用????????#import time.h????????#import mach/mach_time.h????????srandom()的使用????????srandom((unsigned)(mach_absolute_time() 0xFFFFFFFF));????????直接使用 random() 来调用随机数;????????float rotateAngle = M_PI;?? ? ? ?CGAffineTransform transform =CGAffineTransformMakeRotation(rotateAngle);?? ? ? ?imageView.transform = transform;?????? ????????以上代码旋转imageView, 角度为rotateAngle, 方向可以自己测试哦！;????????UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@bg.png]];????????imageView.layer.anchorPoint = CGPointMake(0.5, 1.0); ???????这个是把旋转点设置为底部中间。记住是在QuartzCore.framework中才得到支持。;????????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];????????红色部分可以忽略，只是给rootObj添加一点内容。这个plistData为创建好的plist文件，用其writeToFile方法就可以写成文件。下面是代码：????????????????/*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];???????? }???????? el