iPhone开发笔记

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 *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];

}