苹果iOS开发工作笔记（从事iOS开发一年所总结的常用知识点）

苹果 ios 开发一年的工作笔记

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

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;

  0.0~1.0

竖屏

320X480

横屏

480X320 

状态栏高 (显示时间和网络状态)

20 像素 4

导航栏、工具栏高(返回)

44 像素

隐藏状态栏

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



[[UIApplication shareApplication]



aView.autoresizingSubviews = YES;

aView.autoresizingMask = (UIViewAutoresizingFlexibleWidth |



UIButton *scaleUpButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

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

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

[scaleUpButton addTarget:self

设置视图背景图片

UIImageView *aView;

[UIImage imageNamed:@"image1.png"]];



自定义 UISlider 的样式和滑块

我们使用的是 UISlider 的 setMinimumTrackImage，和 setMaximumTrackImage 方法来定义图

片的，这两个方法可以设置滑块左边和右边的图片的，不过如果用的是同一张图片且宽度

和控件宽度基本一致，就不会有变形拉伸的后果，先看代码，写在 viewDidLoad 中：

//左右轨的图片

UIImage *stetchLeftTrack= [UIImage imageNamed:@"brightness_bar.png"];

UIImage *stetchRightTrack = [UIImage imageNamed:@"brightness_bar.png"];

sliderA.backgroundColor = [UIColor clearColor];

sliderA.value=1.0;

sliderA.minimumValue=0.7;

sliderA.maximumValue=1.0;

[sliderA setThumbImage:thumbImage forState:UIControlStateNormal];

//滑块拖动时的事件

[sliderA addTarget:self action:@selector(sliderValueChanged:)

forControlEvents:UIControlEventValueChanged];

//滑动拖动后的事件

[sliderA addTarget:self action:@selector(sliderDragUp:)

[self.view addSubview:sliderA];



为了大家实验方便，我附上背景图brightness_bar.png和滑块图mark.png

http://pic002.cnblogs.com/images/2011/162291/2011121611431816.png

http://pic002.cnblogs.com/images/2011/162291/2011121611432897.png

-(IBAction)sliderValueChanged:(id)sender{

UISlider *slider = (UISlider *) sender;

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

label.text = newText;

  UIActionSheet *actionSheet = [[UIActionSheet alloc]

          initWithTitle:@”Are you sure?”

          delegate:self

          cancelButtonTitle:@”No way!”

  [actionSheet release];

}



<UIAlertViewDelegate>

buttonIndex

  {

         breathe easy, everything went OK.”];

     UIAlertView *alert = [[UIAlertView alloc]  

               initWithTitle:@”Something was done”

                message:message

                cancelButtonTitle:@”OK”

                otherButtonTitles:nil];

     [alert show];

     [alert release];

     [message release];

  }

动画效果

-(void)doChange:(id)sender

{

[self loadSec];

}

[UIView beginAnimations:nil context:NULL];

[UIView setAnimationDuration:1];    

[UIView setAnimationTransition:([view1 superview]?

UIViewAnimationTransitionFlipFromLeft:UIViewAnimationTransitionFlipFromRight)forView:se

lf.view cache:YES];

 

  if([view1 superview]!= nil)

{

[view1 removeFromSuperview];



[view2 removeFromSuperview];

[self.view addSubview:view1];

}

[UIView commitAnimations];

Table View  <UITableViewDateSource>

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];

reuseIdentifier:SimpleTableIndentifier]

autorelease];

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";