iPhone开发笔记退回输入键盘：自定义颜色：隐藏状态栏：

最新推荐文章于 2017-05-17 10:35:00 发布

转载最新推荐文章于 2017-05-17 10:35:00 发布 · 803 阅读

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本文介绍iOS应用中UI设计的关键技术和实现方法，包括自定义按钮、滑块操作、弹窗显示等交互元素的设计，并探讨了视图动画效果及背景图片设置等实用技巧。

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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];
}