键盘上的return键改成Done: textField.returnKeyType = UIReturnKeyDone;
textfield设置成为密码框: [textField_pwd setSecureTextEntry:YES];
收回键盘: [textField resignFirstResponder]; 或者 [textfield addTarget:self action:@selector(textFieldDone:) forControlEvents:UIControlEventEditingDidEndOnExit];
振动:
#import <AudioToolbox/AudioToolbox.h> //需加头文件
方法一: AudioServicesPlayAlertSound(kSystemSoundID_Vibrate);
方法二: AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
当设备不支持方法一函数时,起蜂鸣作用, 而方法二支持所有设备
用Cocoa删除文件:
NSFileManager *defaultManager = [NSFileManager defaultManager];
[defaultManager removeFileAtPath: tildeFilename handler: nil];
UIView透明渐变与移动效果:
//动画配制开始
[UIView beginAnimations:@"animation" context:nil];
[UIView setAnimationDuration:2.5];
//图片上升动画
CGRect rect = imgView.frame ;
rect.origin.y = 30;
imgView.frame = rect;
//半透明度渐变动画
imgView.alpha = 0;
//提交动画
[UIView commitAnimations];
用HTTP协议，获取www.baidu.com网站的HTML数据:
[NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://www.baidu.com"]];
在UIView的drawRect方法内，用Quartz2D API绘制一个像素宽的水平直线:
-(void)drawRect:(CGRect)rect{
//获取图形上下文
CGContextRef context = UIGraphicsGetCurrentContext();
//设置图形上下文的路径绘制颜色
CGContextSetStrokeColorWithColor(context, [UIColor whiteColor].CGColor);
//取消防锯齿
CGContextSetAllowsAntialiasing(context, NO);
//添加线
CGContextMoveToPoint(context, 50, 50);
CGContextAddLineToPoint(context, 100, 50);
//绘制
CGContextDrawPath(context, kCGPathStroke);
}
用UIWebView加载: www.baidu.com
UIWebView *web = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
[web loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]]];
[self.view addSubview:web];
[web release];
用NSTimer做一个定时器，每隔1秒执行一次 pressedDone;
-(IBAction)clickBtn:(id)sender{
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(printHello) userInfo:nil repeats:YES]; [timer fire]; }
target:self
selector:@selector(pressedDone)
userInfo:nil
repeats:YES];
[timer fire];
}
利用UIImageView实现动画:
- (void)viewDidLoad {
[super viewDidLoad];
UIImageView *fishAni=[[UIImageView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[self.view addSubview:fishAni];
[fishAni release];
//设置动画帧
fishAni.animationImages=[NSArray arrayWithObjects:
[UIImage imageNamed:@"1.jpg"],
[UIImage imageNamed:@"2.jpg"],
[UIImage imageNamed:@"3.jpg"],
[UIImage imageNamed:@"4.jpg"],
[UIImage imageNamed:@"5.jpg"],nil ];
//设置动画总时间
fishAni.animationDuration=1.0;
//设置重复次数，0表示不重复
fishAni.animationRepeatCount=0;
//开始动画
[fishAni startAnimating];
}
利用苹果机里的相机进行录像:
-(void) choosePhotoBySourceType: (UIImagePickerControllerCameraCaptureMode) sourceType
{
m_imagePickerController = [[[UIImagePickerController alloc] init] autorelease];
m_imagePickerController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
m_imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
m_imagePickerController.cameraDevice = UIImagePickerControllerCameraDeviceFront;
//m_imagePickerController.cameraCaptureMode = UIImagePickerControllerCameraCaptureModeVideo;
NSArray *sourceTypes = [UIImagePickerController availableMediaTypesForSourceType:m_imagePickerController.sourceType];
if ([sourceTypes containsObject:(NSString *)kUTTypeMovie ])
{
m_imagePickerController.mediaTypes= [NSArray arrayWithObjects:(NSString *)kUTTypeMovie,(NSString *)kUTTypeImage,nil];
}
// m_imagePickerController.cameraCaptureMode = sourceType;
//m_imagePickerController.mediaTypes
//imagePickerController.allowsEditing = YES;
[self presentModalViewController: m_imagePickerController animated:YES];
}
-(void) takePhoto
{
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
[self choosePhotoBySourceType:nil];
}
}
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
UIButton *takePhoto = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[takePhoto setTitle:@"录像" forState:UIControlStateNormal];
[takePhoto addTarget:self action:@selector(takePhoto) forControlEvents:UIControlEventTouchUpInside];
takePhoto.frame = CGRectMake(50,100,100,30);
[self.view addSubview:takePhoto];
}
在UIImageView中旋转图像:
float rotateAngle = M_PI; //M_PI为一角度
CGAffineTransform transform =CGAffineTransformMakeRotation(rotateAngle);
imageView.transform = transform;
隐藏状态栏:
方法一, [UIApplication sharedApplication] setStatusBarHidden:YES animated:NO];
方法二, 在应用程序的Info.plist 文件中将 UIStatusBarHidden 设置为YES;
构建多个可拖动视图:
@interface DragView: UIImageView{
CGPoint startLocation;
NSString *whichFlower;
}
@property (nonatomic ,retain)NSString *whichFlower;
@end
@implementation DragView
@synthesize whichFlower;
- (void) touchesBegan:(NSSet *)touches withEvent: (UIEvent *)event{
CGPoint pt = [[touhes anyObject ] locationInView:self];
startLocation = pt;
[[self superview] bringSubviewToFront:self];
}
- (void) touchesMoved:(NSSet *)touches withEvent:( UIEvent *)event{
CGPoint pt = [[touches anyObject] locatonInView:self];
CGRect frame = [self frame];
frame.origin.x += pt.x – startLocation.x;
frame.origin.y += pt.y - startLocation.y;
[self setFrame:frame];
}
@end
@interface TestController :UIViewController{
UIView *contentView;
}
@end
@implementation TestController
#define MAXFLOWERS 16
CGPoint randomPoint(){ return CGPointMake(random()%6 , random()96);}
- (void)loadView{
CGRect apprect = [[UIScreen mainScreen] applicationFrame];
contentView = [[UIView alloc] initWithFrame :apprect];
contentView.backgroundColor = [UIColor blackColor];
self.view = contentView;
[contentView release];
for(int i=0 ; i<MAXFLOWERS; i++){
CGRect dragRect = CGRectMake(0.0f ,0.0f, 64.0f ,64.0f);
dragRect.origin = randomPoint();
DragView *dragger = [[DragView alloc] initWithFrame:dragRect];
[dragger setUserInteractionEnabled: YES];
NSString *whichFlower = [[NSArray arrayWithObjects:@”blueFlower.png”,@”pinkFlower.png”,nil] objectAtIndex:( random() %2)];
[dragger setImage:[UIImage imageNamed:whichFlower]];
[contentView addSubview :dragger];
[dragger release];
}
}
- (void)dealloc{
[contentView release];
[super dealloc];
}
@end
隐藏导航栏:
self.navigationController.navigationBarHidden = YES;
定时器timer的使用:
NSTimer *timer = [[NSTimer scheduledTimerWithTimeInterval:5 target:self selector:@selector(timerEvent) userInfo:nil repeats:YES]retain];
在数字键盘上添加button：
//定义一个消息中心
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
//addObserver:注册一个观察员 name:消息名称
- (void)keyboardWillShow:(NSNotification *)note {
// create custom button
UIButton *doneButton = [UIButton buttonWithType:UIButtonTypeCustom];
doneButton.frame = CGRectMake(0, 163, 106, 53);
[doneButton setImage:[UIImage imageNamed:@"5.png"] forState:UIControlStateNormal];
[doneButton addTarget:self action:@selector(addRadixPoint) forControlEvents:UIControlEventTouchUpInside];
// locate keyboard view
UIWindow* tempWindow = [[[UIApplication sharedApplication] windows] objectAtIndex:1];//返回应用程序window
UIView* keyboard;
for(int i=0; i<[tempWindow.subviews count]; i++) //遍历window上的所有subview
{
keyboard = [tempWindow.subviews objectAtIndex:i];
// keyboard view found; add the custom button to it
if([[keyboard description] hasPrefix:@"<UIKeyboard"] == YES)
[keyboard addSubview:doneButton];
}
}
View自己调用自己的方法:
[self performSelector:@selector(loginToNext) withObject:nil afterDelay:2];//黄色段为方法名,和延迟几秒执行.
Alerts 警告:
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil
message:@"An Alert!"
delegate:self
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
将一个控件放在视图之上:
[scrollView insertSubview:searchButton aboveSubview:scrollView];
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