iPhone控件之UIButton

#import "UITestViewController.h"

@implementation UITestViewController

-(void)buttonDown:(id)sender
{
    NSLog(@"Button pushed down");
}

-(void)buttonRelease:(id)sender
{
    NSLog(@"Button released");
}

-(void)checkboxClick:(UIButton *)btn
{
    btn.selected = !btn.selected;
}

- (void)viewDidLoad {
    
    [super viewDidLoad];
    
    //rounded-rect button
    UIButton *roundedRectButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    
    CGRect buttonRect = CGRectMake(100,50,100,35);
    [roundedRectButton setFrame:buttonRect];
    
    [roundedRectButton setTitle:@"Normal" forState:UIControlStateNormal];
    [roundedRectButton setTitle:@"Highlighted" forState:UIControlStateHighlighted];
    roundedRectButton.showsTouchWhenHighlighted = YES;
    
    [roundedRectButton addTarget:self action:@selector(buttonDown:) forControlEvents:UIControlEventTouchDown];
    [roundedRectButton addTarget:self action:@selector(buttonRelease:) forControlEvents:UIControlEventTouchUpInside];
    
    //checkbox control
    UIButton *checkbox = [UIButton buttonWithType:UIButtonTypeCustom];
    
    CGRect checkboxRect = CGRectMake(135,150,36,36);
    [checkbox setFrame:checkboxRect];
    
    [checkbox setImage:[UIImage imageNamed:@"checkbox_off.png"] forState:UIControlStateNormal];
    [checkbox setImage:[UIImage imageNamed:@"checkbox_on.png"] forState:UIControlStateSelected];
    
    [checkbox addTarget:self action:@selector(checkboxClick:) forControlEvents:UIControlEventTouchUpInside];
    
    //custom circular button
    UIButton *circularButton = [UIButton buttonWithType:UIButtonTypeCustom];
    
    CGRect circularRect = CGRectMake(80,220,165,164);
    [circularButton setFrame:circularRect];
    
    UIImage *buttonImage = [UIImage imageNamed:@"circular_button.png"];
    [circularButton setImage:buttonImage forState:UIControlStateNormal];
    
    [circularButton addTarget:self action:@selector(buttonDown:) forControlEvents:UIControlEventTouchUpInside];

    //add all the buttons to the main view
    [self.view addSubview:roundedRectButton];    
    [self.view addSubview:checkbox];    
    [self.view addSubview:circularButton];
}