iphone开发笔记（－） 退回输入键盘：自定义颜色：隐藏状态栏：

退回输入键盘：

- (BOOL) textFieldShouldReturn:(id)textField{
[textField resignFirstResponder];
}

CGRect
CGRect frame = CGRectMake (origin.x, origin.y, size.width, size.height)；矩形
NSStringFromCGRect(someCG) 把CGRect结构转变为格式化字符串；
CGRectFromString(aString) 由字符串恢复出矩形；
CGRectInset(aRect) 创建较小或较大的矩形（中心点相同），＋较小 －较大
CGRectIntersectsRect(rect1, rect2) 判断两矩形是否交叉，是否重叠
CGRectZero 高度和宽度为零的／位于（0，0）的矩形常量

CGPoint & CGSize
CGPoint
aPoint = CGPointMake(x, y); CGSize aSize = CGSizeMake(width, height);

设置透明度 [myView setAlpha:value]; (0.0 < value < 1.0)
设置背景色 [myView setBackgroundColor:[UIColor redColor]];
(blackColor;darkGrayColor;lightGrayColor;whiteColor;grayColor;
redColor;
greenColor;
blueColor;
cyanColor;yellowColor;magentaColor;
orangeColor;purpleColor;brownColor;
clearColor; )
自定义颜色：
UIColor *newColor = [[UIColor alloc] initWithRed:(float) green:(float) blue:(float) alpha:(float)];
0.0~1.0

320X480 480X320 状态栏高 20 像素高 导航栏 工具栏 44像素高
隐藏状态栏：
[[UIApplication shareApplication] setStatusBarHidden: YES animated:NO]

横屏：
[[UIApplication shareApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight].
orientation == UIInterfaceOrientationLandscapeLeft
window=[[UIWindow alloc] initWithFrame:[UIScreen mainScreen] bounds];全屏

自动适应父视图大小：
aView.autoresizingSubviews = YES;
aView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);

定义按钮
UIButton *scaleUpButton = [UIButton
buttonWithType:UIButtonTypeRoundedRect];
[scaleUpButton
setTitle:@"放
大"
forState:UIControlStateNormal];
scaleUpButton.frame =
CGRectMake(40,
420,
100,
40);
[scaleUpButton
addTarget:self
action:@selector(scaleUp)
forControlEvents:UIControlEventTouchUpInside];

设置视图背景图片
UIImageView *aView;
[aView setImage:[UIImage imageNamed:@”name.png”]];
view1.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"image1.png"]];

UISlider *slider = (UISlider *) sender;
NSString *newText = [[NSString alloc] initWithFormat:@”%d”, (int)(slider.value + 0.5f)];
label.text = newText;

活动表单 <UIActionSheetDelegate>

- (IBActive) someButtonPressed:(id) sender
{
UIActionSheet *actionSheet = [[UIActionSheet alloc]
initWithTitle:@”Are you sure?”
delegate:self
cancelButtonTitle:@”No way!”
destructiveButtonTitle:@”Yes, I’m Sure!”
otherButtonTitles:nil];
[actionSheet showInView:self.view];
[actionSheet release];
}

警告视图 <UIAlertViewDelegate>

- (void) actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger) buttonIndex
{
if(buttonIndex != [actionSheet cancelButtonIndex])
{
NSString *message = [[NSString alloc] initWithFormat:@”You can
breathe easy, everything went OK.”];
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:@”Something was done”
message:message
delegate:self
cancelButtonTitle:@”OK”
otherButtonTitles:nil];
[alert show];
[alert release];
[message release];
}
}

动画效果
-(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>
#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
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;
}