createUIimageviw.m

- (void)viewDidLoad
{
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib

  UIImageView *dot =[[UIImageView alloc] initWithFrame:CGRectMake(50,50,20,20)];
  dot.image=[UIImage imageNamed:@"draw.png"];
  [self.view addSubview:dot];

}

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self 
           action:@selector(aMethod:)
 forControlEvents:UIControlEventTouchUpInside];
[button setTitle:@"Show View" forState:UIControlStateNormal];
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);

 buttonName.titleLabel.font = [UIFont fontWithName:@"LuzSans-Book" size:15];
 buttonName.tintColor = [UIColor purpleColor];
 [buttonName setTitleColor:[UIColor purpleColor] forState:UIControlStateNormal];
[view addSubview:button];

UIImage *buttonImage = [UIImage imageNamed:@"Home.png"];
[myButton setBackgroundImage:buttonImage forState:UIControlStateNormal]

UIImage *btnImage = [UIImage imageNamed:@"image.png"];
[btnTwo setImage:btnImage forState:UIControlStateNormal];

http://stackoverflow.com/questions/1560081/how-can-i-create-a-uicolor-from-a-hex-string
http://cocoamatic.blogspot.com/2010/07/uicolor-macro-with-hex-values.html

//导航

self.navigationControl.navigationBarHidden=NO; 

IBOutlet UIButton *btn1;
IBOutlet UIButton *btn2;
write the above 2 lines in your .h file and set the outlets with XIB.

Now create a method called hideButton

-(IBAction)hideButton
{
       btn1.hidden = YES;
}

in XIB attach this method with btn2. So now when you click on btn2 it will hide btn1.

 UIView *uv=[[UIView alloc]initWithFrame:CGRectMake(100, 100, 500, 500)];

    [uv setBackgroundColor:[UIColor blueColor]];

http://www.cnblogs.com/lovecode/articles/2234557.html

UIColor colorWithRed:66.0f/255.0f
                green:79.0f/255.0f
                 blue:91.0f/255.0f
                alpha:1.0f];

    [backToList setTitleColor:UIColorFromRGB(0x2ecc71) forState:UIControlStateNormal];

http://stackoverflow.com/questions/17856055/creating-a-uicollectionview-programmatically

http://stackoverflow.com/questions/17856055/creating-a-uicollectionview-programmatically

UIScrollView *scroll = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 435)];
 scroll.contentSize = CGSizeMake(320, 700);
 scroll.showsHorizontalScrollIndicator = YES;

 NSArray *itemArray = [NSArray arrayWithObjects: @"One", @"Two", @"Three", nil];
 UISegmentedControl *segmentedControl = [[UISegmentedControl alloc] initWithItems:itemArray];
 segmentedControl.frame = CGRectMake(35, 200, 250, 50);
 segmentedControl.segmentedControlStyle = UISegmentedControlStylePlain;
 [segmentedControl addTarget:self action:@selector(MySegmentControlAction:) forControlEvents: UIControlEventValueChanged];
 segmentedControl.selectedSegmentIndex = 1;     
 [scroll addSubview:segmentedControl];
 [segmentedControl release]; 
 [self.view addSubview:scroll];

Then add your method in your class.

- (void)MySegmentControlAction:(UISegmentedControl *)segment 
{    
        if(segment.selectedSegmentIndex == 0)
        {
            // code for the first button
        } 
}

http://stackoverflow.com/questions/15587978/uisegmentedcontrol-inside-title-of-uinavigationbar-looks-unformatted
http://stackoverflow.com/questions/18900034/use-ios-6-style-segmented-control-in-ios-7

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
   UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
   // now you can use cell.textLabel.text
}

http://blog.csdn.net/xumingwei12345/article/details/9664773

重名可能会导致错误异常

http://stackoverflow.com/questions/10784207/uilabel-copywithzone-unrecognized-selector-sent-to-instance