基础知识2
动画效果
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-(void)doChange:(id)sender { if(view2 == nil) { [self loadSec]; } [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:1]; [UIView setAnimationTransition:([view1 superview] ? UIViewAnimationTransitionFlipFromLeft : UIViewAnimationTransitionFlipFromRight)forView : self.view cache:YES]; if([view1 superview]!= nil) { [view1 removeFromSuperview]; [self.view addSubview:view2]; }else { [view2 removeFromSuperview]; [self.view addSubview:view1]; } [UIView commitAnimations]; } |
Table View <UITableViewDateSource>
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#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 = [tableView dequeueReusableCellWithIdentifier: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 = [listData objectAtIndex:row]; cell.textLabel.font = [UIFont boldSystemFontOfSize:20]; if(row < 5) cell.detailTextLabel.text = @"Best friends"; else cell.detailTextLabel.text = @"friends"; return cell; } |
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
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UITableViewCellStyleSubtitle UITableViewCellStyleDefault UITableViewCellStyleValue1 UITableViewCellStyleValue2 <UITableViewDelegate> #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 *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSUInteger row = [indexPath row]; NSString *rowValue = [listData objectAtIndex:row]; NSString *message = [[NSString alloc] initWithFormat:@"You selected %@",rowValue]; UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Row Selected"message:message delegate:nil cancelButtonTitle:@"Yes, I did!" otherButtonTitles:nil]; [alert show]; [alert release]; [message release]; [tableView deselectRowAtIndexPath:indexPath animated:YES]; } //设置行的高度 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { return 40; } |
随机数的使用
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头文件的引用 #import <time.h> #import <mach/mach_time.h> srandom()的使用 srandom((unsigned)(mach_absolute_time() & 0xFFFFFFFF)); 直接使用 random() 来调用随机数 |
在UIImageView 中旋转图像
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float rotateAngle = M_PI; CGAffineTransform transform =CGAffineTransformMakeRotation(rotateAngle); imageView.transform = transform; |
以上代码旋转imageView, 角度为rotateAngle, 方向可以自己测试哦！
