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 < value < 1.0)

设置背景色 [myView setBackgroundColor:[UIColor redColor]]; 

 (blackColor;darkGrayColor;lightGrayColor;whiteColor;grayColor; redColor; greenColor; blueColor; cyanColor;yellowColor;magentaColor;

orangeColor;purpleColor;brownColor; clearColor; )

自定义颜色：

UIColor *newColor = [[UIColor alloc] initWithRed:(float) green:(float) blue:(float) alpha:(float)]; 0.0~1.0




 320X480 480X320 状态栏高 20 像素高 导航栏 工具栏 44像素高

隐藏状态栏：

[[UIApplication shareApplication] setStatusBarHidden: YES animated:NO]


横屏：

[[UIApplication shareApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight].

orientation == UIInterfaceOrientationLandscapeLeft

window=[[UIWindow alloc] initWithFrame:[UIScreen mainScreen] bounds];全屏


自动适应父视图大小：

aView.autoresizingSubviews = YES;

aView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);


 定义按钮

UIButton *scaleUpButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

[scaleUpButton setTitle:@"放 大" forState:UIControlStateNormal];

scaleUpButton.frame = CGRectMake(40, 420, 100, 40);

[scaleUpButton addTarget:self action:@selector(scaleUp) forControlEvents:UIControlEventTouchUpInside];


设置视图背景图片

UIImageView *aView;

[aView setImage:[UIImage imageNamed:@”name.png”]];

view1.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"image1.png"]];


UISlider *slider = (UISlider *) sender;

NSString *newText = [[NSString alloc] initWithFormat:@”%d”, (int)(slider.value + 0.5f)];

label.text = newText;


活动表单 <UIActionSheetDelegate>


 - (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 <UIAlertViewDelegate>


 - (void) actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger) buttonIndex

{

 if(buttonIndex != [actionSheet cancelButtonIndex][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 <UITableViewDateSource>

#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:SimpleTableIndentifier];

 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 < 5)

 cell.detailTextLabel.text = @"Best friends";

 else 

 cell.detailTextLabel.text = @"friends";

 return cell;

}

图像：如果设置图像，则它显示在文本的左侧

文本标签：这是单元的主要文本（UITableViewCellStyleDefault 只显示文本标签）

详细文本标签：这是单元的辅助文本，通常用作解释性说明或标签

UITableViewCellStyleSubtitle

UITableViewCellStyleDefault

UITableViewCellStyleValue1

UITableViewCellStyleValue2


<UITableViewDelegate>

#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;

}