iPad开发笔记


iPad开发笔记
2011年08月26日
   退回输入键盘:
  - (BOOL) textFieldShouldReturn:(id)textField{ [textField resignFirstResponder]; } 
   CGRect
  CGRect frame = CGRectMake (origin.x, origin.y, size.width, size.height);矩形 NSStringFromCGRect(someCG) 把CGRect结构转变为格式化字符串; CGRectFromString(aString) 由字符串恢复出矩形; CGRectInset(aRect) 创建较小或较大的矩形(中心点相同),+较小 -较大 CGRectIntersectsRect(rect1, rect2) 判断两矩形是否交叉,是否重叠 CGRectZero 高度和宽度为零的/位于(0,0)的矩形常量 
   CGPoint & CGSize
  CGPoint aPoint = CGPointMake(x, y); CGSize aSize = CGSizeMake(width, height); 
   设置透明度
  [myView setAlpha:value]; (0.0  [/b]
  - (IBActive) someButtonPressed:(id) sender { UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@”Are you sure?” delegate:self cancelButtonTitle:@”No way!” destructiveButtonTitle:@”Yes, I’m Sure!” otherButtonTitles:nil]; [actionSheet showInView:self.view]; [actionSheet release]; } 
   警告视图 
  - (void) actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger) buttonIndex { if(buttonIndex != [actionSheet cancelButtonIndex]) { NSString *message = [[NSString alloc] initWithFormat:@”You can breathe easy, everything went OK.”]; UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@”Something was done” message:message delegate:self cancelButtonTitle:@”OK” otherButtonTitles:nil]; [alert show]; [alert release]; [message release]; } } 
   动画效果
  -(void)doChange:(id)sender { if(view2 == nil) { [self loadSec]; } [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:1]; [UIView setAnimationTransition:([view1 superview] ? UIViewAnimationTransitionFlipFromLeft : UIViewAnimationTransitionFlipFromRight)forView : self.view cache:YES]; if([view1 superview]!= nil) { [view1 removeFromSuperview]; [self.view addSubview:view2]; }else { [view2 removeFromSuperview]; [self.view addSubview:view1]; } [UIView commitAnimations]; } 
   Table View 
  #pragma mark - #pragma mark Table View Data Source Methods //指定分区中的行数,默认为1 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [self.listData count]; } //设置每一行cell显示的内容 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *SimpleTableIndentifier = @"SimpleTableIndentifier"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:SimpleTableInden tifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:SimpleTableIndentifier] autorelease]; } UIImage *image = [UIImage imageNamed:@"13.gif"]; cell.imageView.image = image; NSUInteger row = [indexPath row]; cell.textLabel.text = [listData objectAtIndex:row]; cell.textLabel.font = [UIFont boldSystemFontOfSize:20]; if(row  #pragma mark - #pragma mark Table View Delegate Methods //把每一行缩进级别设置为其行号 - (NSInteger)tableView:(UITableView *)tableView indentationLevelForRowAtIndexPath:(NSIndexPath *)indexPath { NSUInteger row = [indexPath row]; return row; } //获取传递过来的indexPath值 - (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSUInteger row = [indexPath row]; if (row == 0) return nil; return indexPath; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSUInteger row = [indexPath row]; NSString *rowValue = [listData objectAtIndex:row]; NSString *message = [[NSString alloc] initWithFormat:@"You selected %@",rowValue]; UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Row Selected" message:message delegate:nil cancelButtonTitle:@"Yes, I did!" otherButtonTitles:nil]; [alert show]; [alert release]; [message release]; [tableView deselectRowAtIndexPath:indexPath animated:YES]; } //设置行的高度 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { return 40; } 
   随机数的使用
  头文件的引用 #import  #import  srandom()的使用 srandom((unsigned)(mach_absolute_time() & 0xFFFFFFFF)); 直接使用 random() 来调用随机数 
   在UIImageView 中旋转图像
  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! 在Quartz中如何设置旋转点
  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。 创建.plist文件并存储
  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 里的内容 while(tmp = [nse nextObject]) { NSString *stringBetweenBrackets = nil; NSScanner *scanner = [NSScanner scannerWithString:tmp]; [scanner scanUpToString:@"" intoString:&stringBetweenBrackets]; NSLog([stringBetweenBrackets description]); } 
  对于读写文件,还有补充,暂时到此。随机数和文件读写在游戏开发中经常用到。所以把部分内容放在这,以便和大家分享,也当记录,便于查找。 隐藏NavigationBar
  [self.navigationController setNavigationBarHidden:YES animated:YES]; 
  在想隐藏的ViewController中使用就可以了。 如果无法保证子类行为的一致性,那么就用委托
  If the subClass cann’t keep with superClass,use delegate rather than inheritance. 屏幕上看到的,都是UIVew
  Everything you see on Screen is UIView. 如果对性能要求高,慎用Interface Build
  if application’s performance is important,be discreet for the interface build. copy是创建,retain是引用
  the copy operation is create a new one,but the retain operation is just a reference. alloc需要release,convenient不需要release
  alloc method need corresponding release method,but convenient method not. 加载到NSArray/NSMutableArray里的对象,不需要负责release
  The objects added to NSArray/NSMutableArray need not to be released. IBOutlet,IBAction为你开启了访问Interface Build中对象的大门
  IBOutlet and IBAction open the door to access the objects in Interface build. UIApplicationDelegate负责应用程序的生命周期,而UIViewController负责View的生命周期
  UIApplicationDelegate is responsible for the application life cycle,but UIViewController for the UIView. 为了程序的健壮性,请尽量实现Delegate的生命周期函数
  if you want to develop a robust application,implement the life cycle methods as more as possbile. you触摸的不是UIEvent,而是NSSet的UIView
  what you touch on screen is not UIEvent but UIView UITextField不响应键盘:
  方法1: TextField的的Touch Cancel响应中,添加[textFied resignFirstResponder]; 方法: - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{ [textFied resignFirstResponder]; } 
   更改响应键盘return按钮:
  TextField.returnKeyType=UIReturnKeyDone; select: UIReturnKeyDefault, UIReturnKeyGo, UIReturnKeyGoogle, UIReturnKeyJoin, UIReturnKeyNext, UIReturnKeyRoute, UIReturnKeySearch, UIReturnKeySend, UIReturnKeyYahoo, UIReturnKeyDone, UIReturnKeyEmergencyCall, 
   尺寸问题:
  iPhone应用程序图标大小:57*57; iPhone全屏UIView大小:320*460 添加UITabBar后大小:320*411 UITabelViewCell默认大小: 320*44 
   绘制控件方法
  //--alloc -(UITextField *)GetDefaultTextField:(CGRect)frame{ UITextField *textField=[[UITextField alloc] initWithFrame:frame]; textField.borderStyle=UITextBorderStyleRoundedRect ; textField.font=[UIFont fontWithName:@"Arial" size:12.0]; textField.textAlignment=UITextAlignmentCenter; textField.contentVerticalAlignment=UIControlConten tVerticalAlignmentCenter; textField.keyboardType=UIKeyboardTypeNumbersAndPun ctuation; textField.returnKeyType=UIReturnKeyDone; textField.delegate=self; return textField; } //--alloc -(UILabel *)GetDefaultLabel:(CGRect)frame{ UILabel *label = [[UILabel alloc] initWithFrame: frame]; label.textAlignment=UITextAlignmentCenter; label.textColor=[UIColor blackColor]; label.backgroundColor=[UIColor clearColor]; label.font=[UIFont boldSystemFontOfSize:12.0]; return label; } //--alloc -(UIButton *)GetDefaultButton:(CGRect)frame{ UIButton *button=[[UIButton alloc] initWithFrame:frame]; [button setTitleColor:[UIColor blueColor] forState:UIControlStateNormal]; [button setTitleColor:[UIColor blackColor] forState:UIControlStateHighlighted]; [button setContentHorizontalAlignment:UIControlContentHori zontalAlignmentLeft]; [button.titleLabel setFont:[UIFont boldSystemFontOfSize:14.0]]; [button.titleLabel setLineBreakMode:UILineBreakModeCharacterWrap]; [button addTarget:self action:@selector(btnTradeTouchUpInside:) forControlEvents:UIControlEventTouchUpInside]; [button setContentHorizontalAlignment:UIControlContentHori zontalAlignmentCenter]; [button setBackgroundImage:[UIImage imageNamed:@"png1.png"] forState:UIControlStateNormal]; [button setBackgroundColor:[UIColor lightGrayColor]]; button.tag=kButtonTag; return button;} 
   多使用宏定义常量。tag,frame大小,一些判断标志位。
  #define kIndexValueTag 1 
   苹果屏幕截图快捷键
  一般在Mac上用Command-Shif-3/4来截图。注:Command=苹果键 其实还有几个辅助键,来起到不同的截图功能……  1)Command-Shift-3(适用于OS9,10.1X和10.2) 将整个屏幕拍下并保存到桌面。 2)Command-Shift-4(适用于OS9,10.1X和10.2) 将屏幕的一部分拍下并保存到桌面。当按下着几个键后,光标会变为一个十字,可以拖拉来选取拍报区域。 3)Command-Shift-Control-3(适用于OS9和10.2) 将整个屏幕拍下并保存到剪贴板,可以Command+V直接粘贴到如Photoshop等软件中编辑。 4)Command-Shift-Control-4(适用于OS9和10.2) 将屏幕的一部分拍下并保存到剪贴板。 5)Command-Shift-4再按空格键(适用于10.2) 光标会变成一个照相机,点击可拍下当前窗口或菜单或Dock以及图标等,只要将照相机移动到不用区域(有效区域会显示为浅蓝色)点击。 6)Command-Shift-Control-4再按空格键(适用于10.2) 将选取的窗口或其他区域的快照保存到剪贴板。 7)Command-Shift-Capslock-4(适用于OS9) 将当前的窗口拍下并保存到桌面。 Command-Shift-Capslock-Control-4(适用于OS9) 将当前的窗口拍下并保存到剪贴板。

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转载自wai87wai.iteye.com/blog/1571594