1. 隨機數:
srandom(time(NULL)); //隨機數種子
id d = random(); // 隨機數
id d = random(); // 隨機數
2. 視頻播放:
MPMoviePlayerController *moviePlayer;
moviePlayer = [[MPMoviePlayerController alloc]
initWithContentURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"Movie" ofType:@"m4v"]]];
//初始化視頻播放器對象,並傳入被播放文件的地址
moviePlayer.movieControlMode = MPMovieControlModeDefault;
[moviePlayer play];
//此處有內存溢出
moviePlayer = [[MPMoviePlayerController alloc]
initWithContentURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"Movie" ofType:@"m4v"]]];
//初始化視頻播放器對象,並傳入被播放文件的地址
moviePlayer.movieControlMode = MPMovieControlModeDefault;
[moviePlayer play];
//此處有內存溢出
3. 啟動界面顯示:
iPhone軟件啟動後的第一屏圖片是非常重要的往往就是loading載入中的意思。設置它說來也簡單,但是卻無比重要
只需要在resource裡面將你希望設置的圖片更名為Default.png,這個圖片就可以成為iPhone載入的缺省圖片
4. iPhone的系統目錄:
//得到Document目錄:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//得到temp臨時目錄:
NSString *tempPath = NSTemporaryDirectory();
//得到目錄上的文件地址:
NSString *文件地址 = [目錄地址 stringByAppendingPathComponent:@"文件名.擴展名"];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//得到temp臨時目錄:
NSString *tempPath = NSTemporaryDirectory();
//得到目錄上的文件地址:
NSString *文件地址 = [目錄地址 stringByAppendingPathComponent:@"文件名.擴展名"];
5. 狀態欄顯示Indicator:
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
6.app Icon顯示數字:
- (void)applicationDidEnterBackground:(UIApplication *)application{
[[UIApplication sharedApplication] setApplicationIconBadgeNumber:5];
}
[[UIApplication sharedApplication] setApplicationIconBadgeNumber:5];
}
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *thePath = [paths objectAtIndex:0];
NSString *filePath = [thePath stringByAppendingPathComponent:@"kilonet1.sqlite"];
NSString *dbPath = [[[NSBundle mainBundle] resourcePath]
stringByAppendingPathComponent:@"kilonet2.sqlite"];
NSString *filePath = [thePath stringByAppendingPathComponent:@"kilonet1.sqlite"];
NSString *dbPath = [[[NSBundle mainBundle] resourcePath]
stringByAppendingPathComponent:@"kilonet2.sqlite"];
9. AlertView,ActionSheet的cancelButton點擊事件:
-(void) actionSheet :(UIActionSheet *) actionSheet didDismissWithButtonIndex:(NSInteger) buttonIndex {
NSLog(@"cancel actionSheet........");
//當用戶按下cancel按鈕
if( buttonIndex == [actionSheet cancelButtonIndex]) {
exit(0);
}// //當用戶按下destructive按鈕// if( buttonIndex == [actionSheet destructiveButtonIndex]) {// // DoSomething here.// }
}
- (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex {
NSLog(@"cancel alertView........");
if (buttonIndex == [alertView cancelButtonIndex]) {
exit(0);
}
}
//當用戶按下cancel按鈕
if( buttonIndex == [actionSheet cancelButtonIndex]) {
exit(0);
}// //當用戶按下destructive按鈕// if( buttonIndex == [actionSheet destructiveButtonIndex]) {// // DoSomething here.// }
}
- (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex {
NSLog(@"cancel alertView........");
if (buttonIndex == [alertView cancelButtonIndex]) {
exit(0);
}
}
10.給Window設置全局的背景圖片:
window.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"coolblack.png"]];
11. UITextField文本框顯示及對鍵盤的控制:
#pragma mark -
#pragma mark UITextFieldDelegate
//控制鍵盤跳轉
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
if (textField == _txtAccount) {
if ([_txtAccount.text length]==0) {
return NO;
}
[_txtPassword becomeFirstResponder];
} else if (textField == _txtPassword) {
[_txtPassword resignFirstResponder];
}
return YES;
}
//輸入框背景更換
-(BOOL) textFieldShouldBeginEditing:(UITextField *)textField{
[textField setBackground:[UIImage imageNamed:@"ctext_field_02.png"]];
return YES;
}
-(void) textFieldDidEndEditing:(UITextField *)textField{
[textField setBackground:[UIImage imageNamed:@"ctext_field_01.png"]];
}
//控制鍵盤跳轉
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
if (textField == _txtAccount) {
if ([_txtAccount.text length]==0) {
return NO;
}
[_txtPassword becomeFirstResponder];
} else if (textField == _txtPassword) {
[_txtPassword resignFirstResponder];
}
return YES;
}
//輸入框背景更換
-(BOOL) textFieldShouldBeginEditing:(UITextField *)textField{
[textField setBackground:[UIImage imageNamed:@"ctext_field_02.png"]];
return YES;
}
-(void) textFieldDidEndEditing:(UITextField *)textField{
[textField setBackground:[UIImage imageNamed:@"ctext_field_01.png"]];
}
12.UITextField文本框前面空白寬度設置以及後面組合按鈕設置:
//給文本輸入框後面加入空白
_txtAccount.rightView = _btnDropDown;
_txtAccount.rightViewMode = UITextFieldViewModeAlways;
//給文本輸入框前面加入空白
CGRect frame = [_txtAccount frame];
frame.size.width = 5;
UIView *leftview = [[UIView alloc] initWithFrame:frame];
_txtAccount.leftViewMode = UITextFieldViewModeAlways;
_txtAccount.leftView = leftview;
_txtAccount.rightViewMode = UITextFieldViewModeAlways;
//給文本輸入框前面加入空白
CGRect frame = [_txtAccount frame];
frame.size.width = 5;
UIView *leftview = [[UIView alloc] initWithFrame:frame];
_txtAccount.leftViewMode = UITextFieldViewModeAlways;
_txtAccount.leftView = leftview;
13. UIScrollView 設置滑動不超出本身范圍:
[fcScrollView setBounces:NO];
14. 遍歷View裡面所有的Subview:
NSLog(@"subviews count=%d",[self.view.subviews count]);
if ([self.view.subviews count] > 0) {
for (UIView *curView in self.view.subviews) {
NSLog(@"view.subviews=%@", [NSString stringWithUTF8String:object_getClassName(curView)]);
}
}
for (UIView *curView in self.view.subviews) {
NSLog(@"view.subviews=%@", [NSString stringWithUTF8String:object_getClassName(curView)]);
}
}
14. 在drawRect裡畫文字:
UIFont * f = [UIFont systemFontOfSize:20];
[[UIColor darkGrayColor] set];
NSString * text = @"hi \nKiloNet";
[text drawAtPoint:CGPointMake(center.x,center.y) withFont:f];
15. NSArray查找是否存在對象時用indexOfObject,如果不存在則返回為NSNotFound.
16. NString與NSArray之間相互轉換:
array = [string componentsSeparatedByString:@","];string = [[array valueForKey:@"description"] componentsJoinedByString:@","];
17. TabController隨意切換tab bar:
[self.tabBarController setSelectedIndex:tabIndex];
或者 self.tabBarController.selectedIndex = tabIndex;
或者實現下面的delegate來撲捉tab bar的事件:
-(BOOL) tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {
if ([viewController.tabBarItem.title isEqualToString: NSLocalizedString(@"Logout",nil)]) {
[self showLogout];
return NO;
}
return YES;
}
18. 自定義View之間切換動畫:
- (void) pushController: (UIViewController*) controller
withTransition: (UIViewAnimationTransition) transition
{
[UIView beginAnimations:nil context:NULL];
[self pushViewController:controller animated:NO];
[UIView setAnimationDuration:.5];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationTransition:transition forView:self.view cache:YES];
[UIView commitAnimations];
}
withTransition: (UIViewAnimationTransition) transition
{
[UIView beginAnimations:nil context:NULL];
[self pushViewController:controller animated:NO];
[UIView setAnimationDuration:.5];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationTransition:transition forView:self.view cache:YES];
[UIView commitAnimations];
}
或者:
CATransition *transition = [CATransition animation];
transition.duration = kAnimationDuration;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionPush;
transition.subtype = kCATransitionFromTop;
transitioning = YES;
transition.delegate = self;
[self.navigationController.view.layer addAnimation:transition forKey:nil];
self.navigationController.navigationBarHidden = NO;
[self.navigationController pushViewController:tableViewController animated:YES];
transition.duration = kAnimationDuration;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionPush;
transition.subtype = kCATransitionFromTop;
transitioning = YES;
transition.delegate = self;
[self.navigationController.view.layer addAnimation:transition forKey:nil];
self.navigationController.navigationBarHidden = NO;
[self.navigationController pushViewController:tableViewController animated:YES];
19. UIWebView加載時白色顯示問題解決以及字體統一設置:
uiWebView.opaque = NO;
20.計算字符串長度:
CGFloat w = [title sizeWithFont:[UIFont fontWithName:@"Arial" size:18]].width;
21. iTunesLink should be your applications link
NSString *iTunesLink = @"http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=xxxxxx&mt=8";
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:iTunesLink]];
22.時間轉換NSString & NSDate:
-(NSDate *)NSStringDateToNSDate:(NSString *)string {
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
[formatter setDateFormat:@"yyyy-MM-dd"];
NSDate *date = [formatter dateFromString:string];
[formatter release];
return date;
}
NSString *year = [myDate descriptionWithCalendarFormat:@"%Y" timeZone:nil locale:nil];
or
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy"];
//Optionally for time zone converstions
[formatter setTimeZone:[NSTimeZone timeZoneWithName:@"..."]];
NSString *stringFromDate = [formatter stringFromDate:myNSDateInstance];
22。 模擬器的文件位置
其中#username#表示當前用戶名: /Users/#username#/Library/Application Support/iPhone Simulator/User/Applications/ |
23.在使用UISearchBar時,將背景色設定為clearColor,或者將translucent設為YES,都不能使背景透明,經過一番研究,發現了一種超級簡單和實用的方法:
1 | [[searchbar.subviews objectAtIndex:0]removeFromSuperview]; |
背景完全消除了,只剩下搜索框本身了。
24. 圖像與緩存 :
UIImageView *wallpaper = [[UIImageView alloc] initWithImage: [UIImage imageNamed:@"icon.png"]]; // 會緩存圖片
[UIImage imageWithContentsOfFile:@"icon.png"]]; // 不會緩存圖片
25. iphone-常用的對視圖圖層(layer)的操作
對圖層的操作:
(1.給圖層添加背景圖片:
myView.layer.contents = (id)[UIImage imageNamed:@"view_BG.png"].CGImage;
(2.將圖層的邊框設置為圓腳
myWebView.layer.cornerRadius = 8;
myWebView.layer.masksToBounds = YES;
(3.給圖層添加一個有色邊框
myWebView.layer.borderWidth = 5;
myWebView.layer.borderColor = [[UIColor colorWithRed:0.52 green:0.09 blue:0.07 alpha:1] CGColor];
對圖層的操作:
(1.給圖層添加背景圖片:
myView.layer.contents = (id)[UIImage imageNamed:@"view_BG.png"].CGImage;
(2.將圖層的邊框設置為圓腳
myWebView.layer.cornerRadius = 8;
myWebView.layer.masksToBounds = YES;
(3.給圖層添加一個有色邊框
myWebView.layer.borderWidth = 5;
myWebView.layer.borderColor = [[UIColor colorWithRed:0.52 green:0.09 blue:0.07 alpha:1] CGColor];
26. UIPopoverController 使用
-(void) onSetting:(id) sender {
SplitBaseController *detail = [[SettingServerController alloc] init];
CGRect frame = [(UIView *)sender frame];
frame.origin.y = 0;
UIPopoverController *popwin = [[UIPopoverController alloc] initWithContentViewController:detail];
[popwin setPopoverContentSize:CGSizeMake(400, 300) animated:YES];
popwin.delegate = self;
[popwin presentPopoverFromRect: frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
[detail release];
}
27.在UINavigationBar中添加左箭頭返回按鈕
在iPhone裡面最討厭的控件之一就是 UINavigationBar了。這個控件樣式修改不方便,連添加按鈕也特別麻煩。下面的例子是如何手動添加帶箭頭的按鈕:
UINavigationItem *item = [navBar.items objectAtIndex:0];
UINavigationItem *back = [[UINavigationItem alloc] initWithTitle:@"Back"];
NSArray *items = [[NSArray alloc] initWithObjects:back,item,nil];
[navBar setItems:items];
- (BOOL)navigationBar:(UINavigationBar *)navigationBar
shouldPopItem:(UINavigationItem *)item{
//在此處添加點擊back按鈕之後的操作代碼
return NO;
}
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