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http://mobile.51cto.com/mobile/objc/
Object-C中 NSInteger不是对象
Button动态点击事件：
[msgBtn addTarget:self action:@selector(sel_back:) forControlEvents:UIControlEventTouchUpInside];
页面跳转：
1.present:
vc_info = [[InfoViewController alloc] initWithNibName:@"InfoViewController" bundle:nil];vc_info.modalTransitionStyle = UIModalTransitionStylePartialCurl;[self presentViewController:vc_info animated:YES completion:^{// 跳转 NSLog(@"show InfoView!"); }]; [self dismissViewControllerAnimated:YES completion:nil];// 回退
带参数的页面跳转：
HelpPlayDetailViewController *helpPlayDetailVC = [[HelpPlayDetailViewController alloc] init];
[helpPlayDetailVC setPageNumber:0]; [self.navigationController pushViewController:helpPlayDetailVC animated:YES]; [helpPlayDetailVC release];TableView点击一行跳转：
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{ [tableView deselectRowAtIndexPath:indexPath animated:YES]; MessageDetailViewController *messageDetailVC = [[MessageDetailViewController alloc] init]; [self.navigationController pushViewController:messageDetailVC animated:YES]; [messageDetailVC release]; }IOS 图片平移动画：
-(void)peachAnimation{
UIImageView* peach = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"flower"]]; [self.view addSubview:peach]; //设置动画效果 CGContextRef context = UIGraphicsGetCurrentContext(); //开始播放动画 [UIView beginAnimations:nil context:context]; // [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; // [UIView setAnimationCurve:UIViewAnimationCurveEaseIn]; // [UIView setAnimationCurve:UIViewAnimationCurveEaseOut]; [UIView setAnimationCurve:UIViewAnimationCurveLinear]; [UIView setAnimationDuration:1.5]; [peach setFrame:CGRectMake(250, 400, peach.frame.size.width, peach.frame.size.height)]; [UIView commitAnimations]; }IOS定时器：
[NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(xxx) userInfo:nil repeats:YES];
AlertDialog
-(IBAction)showDialog{ NSLog(@"show dialog"); UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"错误" message:@"请检查您的网络链接!" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil]; [alert show]; [alert release]; } UITextField提示字符：
myTextField.placeholder = @"请在此输入账号";
UITextField圆角：
有时候, 当点击输入框时, 你会发现光标就快挨着左边框了, 很不明显, 这是个很小的用户体验, 解决也很容易, 设置一下UITextField的边框样式
textField.borderStyle = UITextBorderStyleRoundedRect;
这样就明显好看多了, 设置成这个样式后, 四周也会自带圆角, 并且有明显的凹凸效果
UITextField垂直居中：
cloundNameField.contentVerticalAlignment
UITextField字体大小：
LY_Text.font = [UIFont fontWithName:@"helvetica" size:18]; //字体和大小设置
UITextField限制字符长度：
UITextField*nameTxetField=[[UITextField alloc] initWithFrame:CGRectMake(50,100, 200, 30)];
字符串切割
componentsSeparatedByString
字符串替换
str_bangNum = [str_bangNum stringByReplacingOccurrencesOfString:@"A"withString:@"B"];
字符串修剪（过滤提取内容）stringByTrimmingCharactersInSet
NSString *textStr = [searchText stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
字符串按策略分割componentsSeparatedByCharactersInSet
NSArray *arr = [searchText componentsSeparatedByCharactersInSet: [NSCharacterSet whitespaceCharacterSet]];
可拉伸的图片（同Android .9 nine-patch）
UIImage *btn_bg = [UIImageimageNamed:@"voice_tips_bg.png"];
btn_bg = [btn_bg stretchableImageWithLeftCapWidth:8topCapHeight:2];
[thrBtnsetBackgroundImage:btn_bgforState:UIControlStateNormal];
leftCapWidth 和 topCapHeight所指定的四边不会被拉伸
rightCapWIdth = image.width - leftCapWidth - 1, bottomCapHeight同理
如图中， 只有绿色部分会被拉伸缩放
view设置背景图片
self.view.backgroundColor = [UIColorcolorWithPatternImage:[UIImageimageNamed:@"common_bg"]];
IOS消息通知（Java的Observer觀察者）
client:
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(test:) name:@"test" object:nil];
- - (void) test:(NSNotification*) notification
- {
- searchFriendArrary = [notification object];//通过这个获取到传递的对象
- }
[[NSNotificationCenter defaultCenter] postNotificationName:@"test" object:searchFriendArray];
NSString 转 NSMutableString
NSMutableString *str = [stringXXX mutableCopy];
UITableView 去掉背景 分割线
[setting_table setSeparatorColor:[UIColor clearColor]];
UITableView ScrollTo
| 2 3 4 5 | //设置NSIndexPath，其中section:0,row:4 NSIndexPath * ndxPath= [NSIndexPath indexPathForRow: 4 inSection: 0 ]; //将UITableView滚动动ndxPath指定的位置。 [contentTableView scrollToRowAtIndexPath:ndxPath atScrollPosition:UITableViewScrollPositionTop animated:YES]; |
| 2 3 4 5 | //设置NSIndexPath，其中section:0,row:4 NSIndexPath * ndxPath= [NSIndexPath indexPathForRow: 4 inSection: 0 ]; //将UITableView滚动动ndxPath指定的位置。 [contentTableView scrollToRowAtIndexPath:ndxPath atScrollPosition:UITableViewScrollPositionTop animated:YES]; |
刷新当行数据
NSIndexPath * uncheckIndexPath = [NSIndexPathindexPathForRow:indexinSection:section];
[table_AllEvents_reloadRowsAtIndexPaths:@[uncheckIndexPath]
withRowAnimation:NO];
保存图片至GAllery
UIImageWriteToSavedPhotosAlbum([m_imageViewimage], nil,nil, nil);
UIAlertView *alert = [[UIAlertViewalloc] initWithTitle:@""
message:@"保存图片成功"
delegate:nil
cancelButtonTitle:@"确认"
otherButtonTitles:nil];
[alertshow];
[alertrelease];
时间计算：
NSDate *beg = [NSDate date];
NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setHour:-12];
NSDate *end = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] dateByAddingComponents:comps toDate:beg options:0];
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