iphone开发的一些基础概念及代码
1、使用代码添加插座变：
IBOutlet UITextField *nameTextField;
2、使用代码添加动作：
－(IBAction)btnClick:(id)sender;
3、使用UIAlertView：
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:@"Hello"
message:@"This is an alert view"
delegate:self
cancelButtonTitle:@"OK"
otherButtonTitle:nil];
4、使用UIActionSheet：
UIActionSheet *action =
[[UIActionSheet alloc]
initWithTitle:@"Title of Action Sheet"
delegate:self
cancelButtonTitle:@"OK"
destructiveButtonTitle:@"Delegate Message"
otherButtonTitle:@"Option1",@"Option2",nil];
5、为UIPageControl连接事件：
[pageControl addTarget:self
action:@selector(pageTurning:)
forControlEvents:UIControlEventValueChanged];
6、使用UIImageView：
[imageView1 setImage:
[UIImage imageNamed:@"Apple.jpeg"]];
7、为UISegmentedControl连接事件：
[segmentedControl addTarget:self
action:@selector(segmentChanged:)
forControlEvents:UIControlEventValueChanged];
8、使用UIWebView：
NSURL *url = [NSURL URLWithString:@"http://www.apple.com"];
NSURLRequest *req = [NSURequest requestWithURL:url];
[webView loadRequest:req];
9、为切换添加动画：
[UIView beginAnimations:@"flipping view"
context:nil];
[UIView setAnimationDuration:1];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlDown
forView:self.viewcache:YES];
[self.view addSubview:secondViewController.view];
[UIView commitAnimations];
10、处理键盘的Return键：
-(BOOL)textFieldShouldReturn:(UITextField *)textFieldView{
if(textFiedView == textField){
[textField = resignFirstResPonder ];
}
return NO;
}
11、编写代码创建Label视图：
label = [[UILabel alloc]initWithFrame:frame];
label.textAlignment = UITextAlignmentCenter;
label.font = [UIFontWithName:@"Verdana"
size:20];
label.text = @"This is a lable";
12、编写代码创建Button视图：
frame ＝ CGRectMake(10,250,300,50);
button = [[UIButton buttonWithType:UIButtonTypeRoundRect] initWithFrame:frame];
[button setTitle:@"OK" forState:UIControlStateNormal];
button.backgroudColor = [UIColorclearColor];
13、连接事件与事件处理程序：
button addTarget:self
action:@selector(buttonClick:)
forControlEvents:UIControlEventTouchUpInside];
14、切换视图：
myViewController = [[MyViewController alloc]initWithNibName:@"MyView"
bundle:nil];
[self.view addSubview:myViewController.view];
15、在基于导航的应用程序中导航到另一个视图控制器：
[self.navigationController
pushViewController:self.detailsViewController
animated:YES];
16、在表视图中使用属性列表：
使用如下代码定位属性列表
NSString *path = [[NSBundle mainBundle]
pathForResource:@"Movies"
ofType:@"plist"];
然后使用NSDictionary与NSArray对象检索存储在属性列表中的键／值对
17、加载首选项设置的值：
NSUserDefaults *defaults = [NSUserDefauts standardUserDefaults];
NSString *strLoginname = [defaults objectForKey:@"login_name"];
18、保存首选项设置的值：
NSUserDefaults *defaults = [NSUserDefauts standardUserDefaults];
[defaults setObject:loginName.text
forKey:@"login_name"];
19、获取Docunments目录的路径：
NSArray *path = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory,
NSUserDomainMask,YES);
NSString *documentsDir = [path objectAtIndex:0];
20、获取tmp目录的路径：
-(NSString *)tempPath{
return NSTemporaryDirectory();
}
21、检查文件是否存在：
if（［NSFileManager defaultManager]fileExistsAtPath:filePath]）{
}
22、创建NSDictionary对象的可变副本：
NSDictionary *dict = [[NSDictionary alloc]
initWithContentsOfFile:pListPath];
NSMutableDictionary *copyOfDict = [dict mutableCopy];
23、使用NSTimer对象创建定时器：
创建一个每隔半秒调用一次onTimer方法的定时器对象
Timer = [NSTimer scheduledTimerWithTimeInterval:0.5
target:self
selector:@selector(onTimer)
userInfo:nil
repeats:YES];
24、停止NSTimer对象
[timer invalidate];
25、创建连续变化的视觉效果：
[UIView beginAnimations:@"some_text" context:nil];
[UIView commitAnimations];
26、在自己的应用程序中发送邮件：
NSString *emailString =
@"mailto:?to=USER@EMAIL.COM&subject=SUBJECT&
body=BODY OF EMAIL";
[[UIApplication sharedApplication]
openURL:[NSURL
URLWithString:emailString]];
27、调用Safari：
[[UIApplication sharedApplication]
openURL:[NSURL
URLWithString:
@"http://www.apple.com"]];
28、调用Phone：[[UIApplication sharedApplication]
openURL:[NSURL
URLWithString:@“tel:1234567890”]];
29、调用SMS
[[UIApplication sharedApplication]
openURL:[NSURL
URLWithString:@“sms:96924065”]];
