ios开发基础知识 － 2

移动物体

参考：

Field Key Path

Description

rotation.x

The rotation, in radians, in the x axis.

rotation.y

The rotation, in radians, in the y axis.

rotation.z

The rotation, in radians, in the z axis.

rotation

The rotation, in radians, in the z axis. This is identical to setting the rotation.z field.

scale.x

Scale factor for the x axis.

scale.y

Scale factor for the y axis.

scale.z

Scale factor for the z axis.

scale

Average of all three scale factors.

translation.x

Translate in the x axis.

translation.y

Translate in the y axis.

translation.z

Translate in the z axis.

translation

Translate in the x and y axis. Value is an NSSize or CGSize.

访问别的类的属性或者方法

myAppDelegate *appDelegate
= (myAppDelegate *)[[UIApplication sharedApplication] delegate];
[[[appDelegate rootViewController] flipsideViewController] myMethod];


遍历子视图

) {
if (anImage.tag == 1) {
// do something
}
}


播放音乐

[code]	// 设置音乐文件路径
path = [[NSBundle mainBundle] pathForResource:@"mani" ofType:@"mp3"]]
[_cloud02 setFrame:CGRectMake(-1024+rand()%600, -768+rand()%300, 2048, 1536)];
[_cloud01 setFrame:CGRectMake(-1024+rand()%600, -768+rand()%300, 2048, 1536)];

Timer

每秒调用

]
[NSTimer scheduledTimerWithTimeInterval:1     target:self
selector:@selector(myMethod)
userInfo:myObject
repeats:YES];

 myObjectMethod]]
[myTimer invalidate];
myTimer = nil;

时间

CFAbsoluteTime myCurrentTime = CFAbsoluteTimeGetCurrent();
[/code]

在模拟器里测试 App 的加速度感应功能

在模拟器里可以用鼠标点击模拟 iPhone 的触摸操作，但重力感应（比如用户倾斜机身来操控飞机/赛车）怎么模拟？按住 command 再按左右方向键，就能在电脑模拟器上测试加速度感应了。