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);
);
设置透明度
[myView setAlpha:value];(0.0 < value < 1.0)
设置背景色
[myView setBackgroundColor:[UIColorredColor]];
(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
竖屏
320X480
横屏
480X320
状态栏高(显示时间和网络状态)
20 像素
导航栏、工具栏高(返回)
44像素
隐藏状态栏
[[UIApplication shareApplication]setStatusBarHidden: YES animated:NO]
横屏
[[UIApplication shareApplication]
setStatusBarOrientation:UIInterfaceOrientationLandscapeRight].
屏幕变动检测
orientation ==UIInterfaceOrientationLandscapeLeft
全屏
window=[[UIWindow alloc] initWithFrame:[UIScreen mainScreen] bounds];
自动适应父视图大小：
aView.autoresizingSubviews = YES;
aView.autoresizingMask =(UIViewAutoresizingFlexibleWidth |
UIViewAutoresizingFlexibleHeight);
定义按钮
UIButton *scaleUpButton = [UIButtonbuttonWithType: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:[UIImageimageNamed:@”name.png”]];
view1.backgroundColor = [UIColorcolorWithPatternImage:
[UIImageimageNamed:@"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= [UIImageimageNamed:@"brightness_bar.png"];
UIImage *stetchRightTrack = [UIImageimageNamed:@"brightness_bar.png"];
//滑块图片
UIImage *thumbImage = [UIImage imageNamed:@"mark.png"];
UISlider *sliderA=[[UISlider alloc]initWithFrame:CGRectMake(30, 320,257, 7)];
sliderA.backgroundColor = [UIColor clearColor];
sliderA.value=1.0;
sliderA.minimumValue=0.7;
sliderA.maximumValue=1.0;
[sliderA setMinimumTrackImage:stetchLeftTrackforState:UIControlStateNormal];
[sliderA setMaximumTrackImage:stetchRightTrackforState:UIControlStateNormal];
//注意这里要加UIControlStateHightlighted的状态，否则当拖动滑块时滑块将变成原生的控件
[sliderA setThumbImage:thumbImage forState:UIControlStateHighlighted];
[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:)forControlEvents:UIControlEventTouchUpInside];
[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;
label.text = newText
}
活动表单
- (IBActive) someButtonPressed:(id)sender
{
UIActi*****heet *acti*****heet =[[UIActi*****heet alloc]
initWithTitle:@”Are you sure?”
delegate:self
cancelButtonTitle:@”No way!”
destructiveButtonTitle:@”Yes, I’m Sure!”
otherButtonTitles:nil];
[acti*****heetshowInView:self.view];
[acti*****heet release];
}
警告视图
- (void) acti*****heet:(UIActi*****heet *)acti*****heetdidDismissWithButtonIndex:(NSInteger) buttonIndex
{
if(buttonIndex !=[acti*****heet 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];
[alertshow];
[alertrelease];
[messagerelease];
}
}
动画效果
-(void)doChange:(id)sender
{
if(view2 == nil)
{
[self loadSec];
}
[UIView beginAnimati*****:nil context:NULL];
[UIView setAnimationDuration:1];
[UIView setAnimationTransition:([view1superview]?UIViewAnimationTransitionFlipFromLeft:UIViewAnimationTransitionFlipFromRight)forView:self.viewcache:YES];
if([view1 superview]!= nil)
{
[view1 removeFromSuperview];
[self.view addSubview:view2];
}else {
[view2 removeFromSuperview];
[self.view addSubview:view1];
}
[UIView commitAnimati*****];
}
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 = [tableViewdequeueReusableCellWithIdentifier: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 = [listDataobjectAtIndex:row];
cell.textLabel.font =[UIFont boldSystemFontOfSize:20];
if(row < 5)
cell.detailTextLabel.text = @"Bestfriends";
else
cell.detailTextLabel.text =@"friends";
return cell;
}
图像、文本标签和详细文本标签
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
#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 *)tableViewdidSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSUInteger row = [indexPath row];
NSString *rowValue = [listDataobjectAtIndex:row];
NSString *message = [[NSString alloc]initWithFormat:@"You selected %@",rowValue];
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Row Selected"
message:message
delegate:nil
cancelButtonTitle:@"Yes, Idid!"
otherButtonTitles:nil];
[alert show];
[alert release];
[message release];
[tableView deselectRowAtIndexPath:indexPathanimated:YES];
}
//设置行的高度
- (CGFloat)tableView:(UITableView*)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 40;
}
NavigationController 推出push 推出pop
[self.navigationControllerpushViewController:_detailController animated:YES];
[self.navigationControllerpopViewControllerAnimated:YES];
Debug:
NSLog(@"%s %d", __FUNCTION__,__LINE__);
点击textField外的地方回收键盘
先定义一个UIControl类型的对象，在上面可以添加触发事件，令SEL实践为回收键盘的方法,最后将UIControl的实例加到当前View上。
UIControl *m_control = [[UIControl alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];
[m_control addTarget:selfaction:@selector(keyboardReturn)
forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:m_control];
- (void) keyboardReturn
{
[aTextField resignFirstResponder];
}
键盘覆盖输入框
当键盘调出时将输入框覆盖时，可以用下方法：
-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
[self.view setFrame:CGRectMake(0, -100,320, 480) ];
return YES;
}
-(BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
[self.view setFrame:CGRectMake(0, 0, 320,480)];
return YES;
}
当准备输入时，将视图的位置上调100，这样键盘就不能覆盖到输入框。
当依赖注入方法不好使时，可以在AppDelegate内申明一个全局的控制器实例_anotherViewController，在另一个需要使用_anotherViewController的地方定义以下委托方法，使用共享的UIApplication实例来获取该委托的引用
SomeAppDelegate *appDelegate =(SomeAppDelegate *)[[UIApplication sharedApplication] delegate];
_anotherViewController =appDelegate._anotherViewController;
UIViewController内建Table View
纯代码在UIViewController控制器内建Table View
@interface RootViewController :UIViewController {
NSArray *timeZoneNames;
}
@property (nonatomic,retain) NSArray*timeZoneNames;
@end
(void) loadView
{
UITableView *tableView = [[UITableViewalloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]] style:UITableViewStylePlain];
tableView.autoresizingMask =(UIViewAutoresizingFlexibleHeight | UIViewAutoresizingWidth);
tableView.delegate = self;
tableView.dataSource = self;
[tableView reloadData];
self.view = tableView;
[tableView release];
}
将plist文件中的数据赋给数组
NSString *thePath = [[NSBundle mainBundle]pathForResource:@"States" ofType:@"plist"];
NSArray *array = [NSArrayarrayWithContentsOfFile:thePath];
UITouch
手指的触摸范围：64X64
#pragma mark -
#pragma mark Touch Events
- (void)touchesBegan:(NSSet *) toucheswithEvent:(UIEvent *) event {
originFrame = bookCover.frame;
NSLog(@"%s %d",__FUNCTION__,__LINE__);
if ([touches count] == 2)
{
NSArray *twoTouches = [touches allObjects];
UITouch *firstTouch = [twoTouchesobjectAtIndex:0];
UITouch *secondTouch = [twoTouchesobjectAtIndex:1];
CGPoint firstPoint = [firstTouchlocationInView:bookCover];
CGPoint secondPoint = [secondTouchlocationInView:bookCover];
CGFloat deltaX = secondPoint.x -firstPoint.x;
CGFloat deltaY = secondPoint.y - firstPoint.y;
initialDistance = sqrt(deltaX * deltaX +deltaY * deltaY );
frameX = bookCover.frame.origin.x;
frameY = bookCover.frame.origin.y;
frameW = bookCover.frame.size.width;
frameH = bookCover.frame.size.height;
NSLog(@"%s %d",__FUNCTION__,__LINE__);
}
}
- (void)touchesMoved:(NSSet *) toucheswithEvent:(UIEvent *) event {
if([touches count] == 2)
{
NSLog(@"%s %d",__FUNCTION__,__LINE__);
NSArray *twoTouches = [touches allObjects];
UITouch *firstTouch = [twoTouchesobjectAtIndex:0];
UITouch *secondTouch = [twoTouchesobjectAtIndex:1];
CGPoint firstPoint = [firstTouchlocationInView:bookCover];
CGPoint secondPoint = [secondTouchlocationInView:bookCover];
CGFloat deltaX = secondPoint.x -firstPoint.x;
CGFloat deltaY = secondPoint.y -firstPoint.y;
CGFloat currentDistance = sqrt(deltaX *deltaX + deltaY * deltaY );
if (initialDistance == 0) {
initialDistance = currentDistance;
}
else if (currentDistance !=initialDistance)
{
CGFloat changedDistance = currentDistance -initialDistance;
NSLog(@"changedDistance =%f",changedDistance);
[bookCover setFrame:CGRectMake(frameX -changedDistance / 2,
frameY - (changedDistance * frameH) / (2 *frameW),
frameW + changedDistance,
frameH + (changedDistance * frameH) /frameW)];
}
}
}
- (void)touchesEnded:(NSSet *) toucheswithEvent:(UIEvent *) event {
UITouch *touch = [touches anyObject];
UITouch双击图片变大/还原
if ([touch tapCount] == 2)
{
NSLog(@"%s %d",__FUNCTION__,__LINE__);
if (!flag) {
[bookCoversetFrame:CGRectMake(bookCover.frame.origin.x - bookCover.frame.size.width / 2,
bookCover.frame.origin.y -bookCover.frame.size.height / 2,
2 * bookCover.frame.size.width,
2 * bookCover.frame.size.height)];
flag = YES;
}
else {
[bookCoversetFrame:CGRectMake(bookCover.frame.origin.x + bookCover.frame.size.width / 4,bookCover.frame.origin.y + bookCover.frame.size.height / 4,
bookCover.frame.size.width / 2,bookCover.frame.size.height / 2)];
flag = NO;
}
}
}
Get the Location of Touches
(CGPoint)locationInView:(UIView *)view
(CGPoint)previousLocationInView:(UIView*)view
view window
Getting Touch Attributes
tapCount(read only) times*****p(read only)phase(read only)
Getting a Touch Object's GestureRecognizers
gestureRecognizers
Touch Phase
UITouchPhaseBegan
UITouchPhaseMoved
UITouchPhaseStationary
UITouchPhaseEnded
UITouchPhaseCancelled
从Plist里读内容
NSString *plistPath = [[NSBundlemainBundle] pathForResource:@"book" ofType:@"plist"];
NSDictionary *dictionary = [[NSDictionaryalloc] initWithContentsOfFile:plistPath];
NSString *book = [dictionaryobjectForKey:bookTitle];
[textView setText:book];
(void) initialize {
NSUserDefaults = [NSUserDefaults standardUserDefaults];
NSDictionary *appDefaults = [NSDictionarydictionaryWithObject:@"YES" forKey:@"DeleteBackup"];
[defaults registerDefaults:appDefaults];
}
To get a value of a default, use thevalueForKey: method:
[[theDefaultsController values] valueForKey:@"userName"];
To set a value for a default, usesetValue:forKey:
[[theDefaultsController values]setValue:newUserName forKey:@"userName"];
[[NSUserDefaults standardUserDefaults]setValue:aVale forKey:aKey];
[[NSUserDefaults standardUserDefaults]valueForKey:aKey];
获取Documents目录
NSArray *paths =NSSearchPathForDictionariesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [pathsobjectAtIndex:0];
NSString *filename = [documentsDirectory
stringByAppendingPathComponent:@"theFile.txt"];
获取tmp目录
NSString *tempPath =NSTemporaryDirectory();
NSString *tempFile = [tempPathstringByAppendingPathComponent:@"tempFile.txt"];
[[NSUserDefaults standardUserDefaults]setObject:data forKey:@"someKey"];
[[NSUserDefaults standardUserDefaults] objectForKey:aKey];
[[NSUserDefaults standardUserDefaults] objectForKey:aKey];
NSNotification
自定义NavigationBar
navigationBar = [[UINavigationBar alloc]initWithFrame:CGRectMake(0, 0, 320, 44)];
[navigationBarsetBarStyle:UIBarStyleBlackOpaque];
myNavigationItem = [[UINavigationItemalloc] initWithTitle:@"Setting"];
[navigationBar setItems:[NSArrayarrayWithObject:myNavigationItem]];
[self.view addSubview:navigationBar];
backButton = [[UIBarButtonItem alloc]initWithTitle:@"Back" style:UIBarButtonItemStylePlain target:selfaction:@selector(back)];
myNavigationItem.leftBarButtonItem =backButton;
