黑马程序员—IOS按钮用法与属性实例

来源：互联网发布：耐克销售额的数据图表编辑：程序博客网时间：2024/04/27 16:41

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IOS 按钮（button）用法与属性实例

 (void) toggleButton: (UIButton *) button{if (isOn = !isOn){[button setTitle:@"On" forState:UIControlStateNormal];[button setTitle:@"On" forState:UIControlStateHighlighted];[button setBackgroundImage:baseGreen forState:UIControlStateNormal];[button setBackgroundImage:altGreen forState:UIControlStateHighlighted];}else{[button setTitle:@"Off" forState:UIControlStateNormal];[button setTitle:@"Off" forState:UIControlStateHighlighted];[button setBackgroundImage:baseRed forState:UIControlStateNormal];[button setBackgroundImage:altRed forState:UIControlStateHighlighted];}}- (void) viewDidLoad{float capWidth = 110.0f;baseGreen = [[[UIImage imageNamed:@"green.png"] stretchableImageWithLeftCapWidth:capWidthtopCapHeight:0.0f] retain];baseRed = [[[UIImage imageNamed:@"red.png"] stretchableImageWithLeftCapWidth:capWidthtopCapHeight:0.0f] retain];altGreen = [[[UIImage imageNamed:@"green2.png"] stretchableImageWithLeftCapWidth:capWidthtopCapHeight:0.0f] retain];altRed = [[[UIImage imageNamed:@"red2.png"] stretchableImageWithLeftCapWidth:capWidthtopCapHeight:0.0f] retain];// 创建UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];button.frame = CGRectMake(0.0f, 0.0f, 300.0f, 233.0f);button.center = CGPointMake(160.0f, 140.0f);// 设置aligment 属性button.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;//button.titleLabel.textAlignment = UITextAlignmentCenter;//设置title自适应对齐button.titleLabel.lineBreakMode = UILineBreakModeWordWrap;// 设置颜色和字体[button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];[button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateHighlighted];button.titleLabel.font = [UIFont boldSystemFontOfSize:24.0f];// 添加 action[button addTarget:self action:@selector(toggleButton:) forControlEvents: UIControlEventTouchUpInside];    //设置title    [button setTitle:@"On" forState:UIControlStateNormal];    [button setTitle:@"On" forState:UIControlStateHighlighted];    //设置背景    [button setBackgroundImage:baseGreen forState:UIControlStateNormal];    [button setBackgroundImage:altGreen forState:UIControlStateHighlighted];// 用于测试的BOOLisOn = NO;// 把button放入view[self.view addSubview:button];}

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