[TwistedFate]UIButton 应用启动流程

UIButton

初始化

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

设置位置

button.frame = CGRectMake(100, 100, 100, 100);

设置颜色

button.backgroundColor = [UIColor greenColor];

设置标题

// 三种状态
[button setTitle:@"普通状态" forState:UIControlStateNormal];
[button setTitle:@"高亮" forState:UIControlStateHighlighted];
[button setTitle:@"选中" forState:UIControlStateSelected];

设置标题颜色

[button setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
[button setTitleColor:[UIColor blackColor] forState:UIControlStateHighlighted];
[button setTitleColor:[UIColor blueColor] forState:UIControlStateSelected];

添加方法

[button addTarget:self action:@selector(click:) forControlEvents:(UIControlEventTouchUpInside)];
// 点下去抬起来的时候触发

给button添加一个前景图片

// 创建一张图片
// 如果不是png格式的图片 需要把后缀加上 如果是png格式 可以不加后缀
[button setImage:[UIImage imageNamed:@"Normal"] forState:UIControlStateNormal];
[button setImage:[UIImage imageNamed:@"Highlighted"] forState:UIControlStateHighlighted];
[button setImage:[UIImage imageNamed:@"Selected"] forState:UIControlStateSelected];

给button添加背景图片

[button setBackgroundImage:[UIImage imageNamed:@"Normal"] forState:(UIControlStateNormal)];
[button setBackgroundImage:[UIImage imageNamed:@"Highlighted"] forState:(UIControlStateHighlighted)];
[button setBackgroundImage:[UIImage imageNamed:@"Selected"] forState:(UIControlStateSelected)];
// 显示视图
[self.window addSubview:button];

button的响应事件

- (void)click:(UIButton *)button{
// 更改一下选中状态
// 按一下进入选中状态 再按一下进入普通状态
button.selected = !button.selected; // 取反
//button.backgroundColor = [UIColor blackColor];
NSLog(@"按钮按了");
}

FUNCTION LINE

// 常用的调试方式
// __FUNCTION__ 打印 调用了那个方法
// __LINE__打印这个方法在多少行
NSLog(@"%s %d",__FUNCTION__,__LINE__);
NSLog(@"程序小退出");

应用启动流程

- (void)applicationWillResignActive:(UIApplication *)application
// 程序小退出
- (void)applicationDidEnterBackground:(UIApplication *)application
// 程序已经进入后台
- (void)applicationWillEnterForeground:(UIApplication *)application
// 程序将要进入前台
- (void)applicationDidBecomeActive:(UIApplication *)application
// 程序已经激活
- (void)applicationWillTerminate:(UIApplication *)application
// 程序意外退出
- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application
// 内存警告时会触发
![这里写图片描述](http://img.blog.csdn.net/20151113212134358)