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▪关于init步骤的解释 关于init方法的解释- (id)init
{
self = [super init];
if (self) {
//..........
}
return self;
}
[super init]的返回值和self的类型都是id类型，所以可以这么写。
如果父类初始化失败，会返回nil.........
▪ Qt移植到开发板下怎么使用触摸屏及改变界面大小 Qt移植到开发板上如何使用触摸屏及改变界面大小 触摸屏：
一、首先要在开发板上安装tslib ，具体安装步骤参考我之前的博客：http://blog.csdn.net/start530/article/details/8018096
二、安装完后，加载.........
▪ 简略的仿Path风格菜单的实现 简单的仿Path风格菜单的实现刚开始只是在顶部导航栏添加两个按钮，用来控制主屏的左右移动。
- (void)setupNavBar
{
_navBar = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.middleView.frame.size.width, 44)];.........
[1]关于init步骤的解释
来源: 互联网 发布时间: 2014-02-18
关于init方法的解释
- (id)init
{
self = [super init];
if (self) {
//..........
}
return self;
}[super init]的返回值和self的类型都是id类型，所以可以这么写。
如果父类初始化失败，会返回nil。所以要判断父类是不是初始化成功了，才能做子类的初始化。因为万一没有初始化成功，相当于对nil操作，会报exception。
[2] Qt移植到开发板下怎么使用触摸屏及改变界面大小
来源: 互联网 发布时间: 2014-02-18
Qt移植到开发板上如何使用触摸屏及改变界面大小
触摸屏：
一、首先要在开发板上安装tslib ，具体安装步骤参考我之前的博客：http://blog.csdn.net/start530/article/details/8018096
二、安装完后，加载触摸屏驱动：insmod ts.ko，然后运行./ts_calibrate 进行五点校准，之后会在/etc/下生成一个文件 pointercal，要有这个触摸屏才能用。
三、修改/etc/profile：
添加这几行 ：
export QWS_MOUSE_PROTO=Tslib:/dev/input/event0 （这个event*是根据你加载触摸屏驱动后 ls /dev/event* ,然后查看新添加的是哪个event）
export QWS_DISPLAY=LinuxFb:/dev/fb0
export QWS_SIZE=480x272 （通过这个设置qt界面的大小）
保存，退出，在命令行输入 source /etc/profile
四、运行qt可执行程序，ok
界面大小：
在qt main.cpp函数里添加
MainWindow w;
w.resize(480,272); (开发板lcd分辨率)
w.show();
转载请出名出处！
[3] 简略的仿Path风格菜单的实现
来源: 互联网 发布时间: 2014-02-18
简单的仿Path风格菜单的实现
并且是通过点击按钮修改button的tag来记录当前屏幕展示的状态，有点挫。
通过屏幕状态变量来控制屏幕的左右滑动：
当完成这样的功能后，我在模拟器上跑了下，觉得还行。不过在真机跑的时候，我习惯用拇指来滑动，而不是用导航栏的按钮。
刚开始只是在顶部导航栏添加两个按钮，用来控制主屏的左右移动。
- (void)setupNavBar
{
_navBar = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.middleView.frame.size.width, 44)];
self.navBar.backgroundColor = [UIColor blueColor];
[self.middleView addSubview:self.navBar];
UIButton *leftNavBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
leftNavBtn.frame = CGRectMake(10, 0, 44, 44);
[self.navBar addSubview:leftNavBtn];
[leftNavBtn setTitle:@"Left" forState:UIControlStateNormal];
[leftNavBtn addTarget:self action:@selector(leftNavBtnDidClick:) forControlEvents:UIControlEventTouchUpInside];
UIButton *rightNavBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
rightNavBtn.frame = CGRectMake(self.navBar.frame.size.width - 10 - 44, 0, 44, 44);
[self.navBar addSubview:rightNavBtn];
[rightNavBtn setTitle:@"Right" forState:UIControlStateNormal];
[rightNavBtn addTarget:self action:@selector(rightNavBtnDidClick:) forControlEvents:UIControlEventTouchUpInside];
}并且是通过点击按钮修改button的tag来记录当前屏幕展示的状态，有点挫。
后来整理了下，设置一个状态变量：
typedef enum _screenStateType {
kNormalState = 0,
kLeftState, // Show the left-view
kRightState, // Show the right-view
kDriftingState // Drifting
} ScreenStateType;通过屏幕状态变量来控制屏幕的左右滑动：
#pragma mark - Slide to Left or Right
#define LEFT_SLIDE_OFFSET 260.0f
#define RIGHT_SLIDE_OFFSET (-260.0f)
- (void)leftNavBtnDidClick:(UIButton *)btn
{
if (kNormalState == self.screenState) {
[self slideFromeState:self.screenState toState:kLeftState];
} else {
[self slideFromeState:self.screenState toState:kNormalState];
}
}
- (void)rightNavBtnDidClick:(UIButton *)btn
{
if (kNormalState == self.screenState) {
[self slideFromeState:self.screenState toState:kRightState];
} else {
[self slideFromeState:self.screenState toState:kNormalState];
}
}
- (void)slideFromeState:(ScreenStateType)oState toState:(ScreenStateType)dState
{
if (self.isSliding) return ;
self.isSliding = YES;
__block CGRect rect = self.middleView.frame;
rect.origin.x = 0.0f;
id completionBlk = nil;
switch (oState) {
case kNormalState:
if (kLeftState == dState) {
self.rightView.hidden = YES;
rect.origin.x = LEFT_SLIDE_OFFSET;
} else if (kRightState == dState) {
self.leftView.hidden = YES;
rect.origin.x = RIGHT_SLIDE_OFFSET;
}
break;
case kLeftState:
case kRightState:
if (kNormalState == dState) {
completionBlk = ^(BOOL finished) { self.leftView.hidden = NO; self.rightView.hidden = NO; };
}
break;
case kDriftingState:
if (kLeftState == dState) {
rect.origin.x = LEFT_SLIDE_OFFSET;
} else if (kRightState == dState) {
rect.origin.x = RIGHT_SLIDE_OFFSET;
} else if (kNormalState == dState) {
completionBlk = ^(BOOL finished) { self.leftView.hidden = NO; self.rightView.hidden = NO; };
}
break;
default:
break;
}
id animationBlk = ^{ self.middleView.frame = rect; };
[UIView animateWithDuration:0.3f animations:animationBlk completion:completionBlk];
self.screenState = dState;
self.isSliding = NO;
}当完成这样的功能后，我在模拟器上跑了下，觉得还行。不过在真机跑的时候，我习惯用拇指来滑动，而不是用导航栏的按钮。
当修改为可以通过手指滑屏后，又发现太容易滑了，有点影响用户体验，所以在移动过程先尝试检测下用户是否真的想滑屏：
#pragma mark - Finger Touch
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint fingerPoint = [touch locationInView:self.middleView];
if ([self.middleView pointInside:fingerPoint withEvent:nil]) {
fingerPoint = [touch locationInView:self.view];
self.lastFingerX = fingerPoint.x;
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint fingerPoint = [touch locationInView:self.view];
// The user really wants to move the screen ?
if (!self.canDrag && abs(fingerPoint.x - self.lastFingerX) > 30) {
self.canDrag = YES ;
self.lastFingerX = fingerPoint.x;
}
if (!self.canDrag) return ;
CGRect rect = self.middleView.frame;
rect.origin.x += (fingerPoint.x - self.lastFingerX);
rect.origin.x = (rect.origin.x > LEFT_SLIDE_OFFSET) ? LEFT_SLIDE_OFFSET : rect.origin.x;
rect.origin.x = (rect.origin.x < RIGHT_SLIDE_OFFSET) ? RIGHT_SLIDE_OFFSET : rect.origin.x;
self.middleView.frame = rect;
if (rect.origin.x > 0) {
self.rightView.hidden = YES;
self.leftView.hidden = NO;
} else if (rect.origin.x < 0) {
self.leftView.hidden = YES;
self.rightView.hidden = NO;
} else {
self.leftView.hidden = self.rightView.hidden = NO;
}
self.lastFingerX = fingerPoint.x;
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
self.canDrag = NO;
CGFloat boundary = 50.0f;
CGRect rect = self.middleView.frame;
ScreenStateType lastScreenState = self.screenState;
self.screenState = kDriftingState;
switch (lastScreenState) {
case kNormalState:
if (rect.origin.x < (0 - boundary)) {
[self slideFromeState:self.screenState toState:kRightState];
} else if (rect.origin.x > (0 + boundary)) {
[self slideFromeState:self.screenState toState:kLeftState];
} else {
[self slideFromeState:self.screenState toState:kNormalState];
}
break;
case kLeftState:
if (rect.origin.x < LEFT_SLIDE_OFFSET - boundary) {
[self slideFromeState:self.screenState toState:kNormalState];
} else {
[self slideFromeState:self.screenState toState:kLeftState];
}
break;
case kRightState:
if (rect.origin.x > RIGHT_SLIDE_OFFSET + boundary) {
[self slideFromeState:self.screenState toState:kNormalState];
} else {
[self slideFromeState:self.screenState toState:kRightState];
}
break;
default:
[self slideFromeState:self.screenState toState:kNormalState];
break;
}
}
完整的代码参见：https://gist.github.com/3857426
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