控件的使用

创建UIButton

 

// Create a button sized to our art
	UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
	button.frame = CGRectMake(0.0f, 0.0f, 300.0f, 233.0f);
	button.center = CGPointMake(160.0f, 140.0f);
	
	// Set up the button aligment properties
	button.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
	button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
	
	// Set the font and color
	[button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
	[button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateHighlighted];
	
	// Hard code carriage returns
	// button.titleLabel.font = [UIFont boldSystemFontOfSize:36.0f];
	// [button setTitle:@"Word1\nWord2\nWord3" forState: UIControlStateNormal];
	
	// Let label handle carriage returns
	button.titleLabel.font = [UIFont boldSystemFontOfSize:36.0f];
	[button setTitle:@"Lorem Ipsum Dolor Sit" forState: UIControlStateNormal];
	
	button.titleLabel.textAlignment = UITextAlignmentCenter;
	button.titleLabel.lineBreakMode = UILineBreakModeWordWrap;
	
	// Add action
	[button addTarget:self action:@selector(toggleButton:) forControlEvents: UIControlEventTouchUpInside];

创建一个动画

 

// Load Butterflies
	NSMutableArray *bflies = [NSMutableArray array];
	UIImage *img;
	for (int i = 1; i <= 17; i++) {
		NSString *bfname = [NSString stringWithFormat:@"bf_%d.png", i];
		if (img = [UIImage imageNamed:bfname]) [bflies addObject:img];
	}
	
	UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 80.0f, 80.0f)];
	[imageView setAnimationImages:bflies];
	[imageView setAnimationDuration:1.2f];
	[imageView startAnimating];
	imageView.center = button.center;

 一个UIButton翻转的例子

 

@implementation TestBedViewController
- (IBAction) flip: (UIButton *) button
{
	// Hide the view that's going away
	[self.view viewWithTag:BUTTON1].alpha = 1.0f;
	[self.view viewWithTag:BUTTON2].alpha = 1.0f;
	[button setAlpha:0.0f];

	// Decide which animation to use
	UIViewAnimationTransition trans;
	trans = (button.tag == BUTTON1) ? UIViewAnimationTransitionFlipFromLeft : UIViewAnimationTransitionFlipFromRight;

	// Animate the flip
	[UIView beginAnimations:nil context:NULL];
	[UIView setAnimationDuration:1.0f];
	[UIView setAnimationTransition:trans forView:[self.view viewWithTag:CLEARVIEW] cache:YES];
	[[self.view viewWithTag:CLEARVIEW] exchangeSubviewAtIndex:0 withSubviewAtIndex:1];
	[UIView commitAnimations];
}

 UISilder的使用

 

// Create slider
UISlider *slider = [[UISlider alloc] initWithFrame:baseFrame];
slider.center = CGPointMake(160.0f, 140.0f);
slider.value = 0.0f;
	
// Create the callbacks for touch, move, and release
[slider addTarget:self action:@selector(startDrag:) forControlEvents:UIControlEventTouchDown];
[slider addTarget:self action:@selector(updateThumb:) forControlEvents:UIControlEventValueChanged];
[slider addTarget:self action:@selector(endDrag:) forControlEvents:UIControlEventTouchUpInside | UIControlEventTouchUpOutside];

// Present the slider
[self.view addSubview:slider];
[self performSelector:@selector(updateThumb:) withObject:slider afterDelay:0.1f];

//创建图片的例子

- (UIImage *) createImageWithLevel: (float) aLevel
{
	UIGraphicsBeginImageContext(CGSizeMake(40.0f, 100.0f));
	CGContextRef context = UIGraphicsGetCurrentContext();

	float INSET_AMT = 1.5f;

	// Create a filled rect for the thumb
	[[UIColor darkGrayColor] setFill];
	CGContextAddRect(context, CGRectMake(INSET_AMT, 40.0f + INSET_AMT, 40.0f - 2.0f * INSET_AMT, 20.0f - 2.0f * INSET_AMT));
	CGContextFillPath(context);
	
	// Outline the thumb
	[[UIColor whiteColor] setStroke];
	CGContextSetLineWidth(context, 2.0f);	
	CGContextAddRect(context, CGRectMake(2.0f * INSET_AMT, 40.0f + 2.0f * INSET_AMT, 40.0f - 4.0f * INSET_AMT, 20.0f - 4.0f * INSET_AMT));
	CGContextStrokePath(context);

	// Create a filled ellipse for the indicator
	[[UIColor colorWithWhite:aLevel alpha:1.0f] setFill];
	CGContextAddEllipseInRect(context, CGRectMake(0.0f, 0.0f, 40.0f, 40.0f));
	CGContextFillPath(context);
	
	// Label with a number
	NSString *numstring = [NSString stringWithFormat:@"%0.1f", aLevel];
	UIColor *textColor = (aLevel > 0.5f) ? [UIColor blackColor] : [UIColor whiteColor];
	centerText(context, @"Georgia", 20.0f, numstring, CGPointMake(20.0f, 20.0f), textColor);
	
	// Outline the indicator circle
	[[UIColor grayColor] setStroke];
	CGContextSetLineWidth(context, 3.0f);	
	CGContextAddEllipseInRect(context, CGRectMake(INSET_AMT, INSET_AMT, 40.0f - 2.0f * INSET_AMT, 40.0f - 2.0f * INSET_AMT));
	CGContextStrokePath(context);
	
	// Build and return the image
	UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
	UIGraphicsEndImageContext();
	return theImage;
}

//设置UISlider点击和正常两种状态
// create a new custom thumb image and use it for the highlighted state
UIImage *customimg = [self createImageWithLevel:aSlider.value];
[aSlider setThumbImage: simpleThumbImage forState: UIControlStateNormal];
[aSlider setThumbImage: customimg forState: UIControlStateHighlighted];
previousValue = aSlider.value;

 

 

 

 

 

 

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