文档介绍：退回输入键盘  - (BOOL)textFieldShouldReturn:(id)textField{  [textField resignFirstResponder];} CGRectCGRectframe=CGRectMake(,,,);矩形NSStringFromCGRect(someCG)把CGRect结构转变为格式化字符串;CGRectFromString(aString)由字符串恢复出矩形;CGRectInset(aRect)创建较小或较大的矩形(中心点相同),+较小 -较大CGRectIntersectsRect(rect1,rect2)判断两矩形是否交叉,是否重叠CGRectZero高度和宽度为零的/位于(0,0)的矩形常量 CGPoint&CGSizeCGPointaPoint=CGPointMake(x,y);  CGSizeaSize=CGSizeMake(width,height); 设置透明度[myViewsetAlpha:value]; (<value<)设置背景色[myViewsetBackgroundColor:[UIColorredColor]]; (blackColor;darkGrayColor;lightGrayColor;whiteColor;grayColor;redColor;greenColor;blueColor;cyanColor;yellowColor;magentaColor;orangeColor;purpleColor;brownColor;clearColor;)自定义颜色UIColor*newColor=[[UIColoralloc]initWithRed:(float)green:(float)blue:(float)alpha:(float)];   ~  状态栏高(显示时间和网络状态)20像素 导航栏、工具栏高(返回)44像素隐藏状态栏[[UIApplicationshareApplication]setStatusBarHidden:YESanimated:NO] 横屏[[UIApplicationshareApplication]setStatusBarOrientation:UIInterfaceOrientationLandscapeRight].屏幕变动检测orientation==UIInterfaceOrientationLandscapeLeft全屏window=[[UIWindowalloc]initWithFrame:[UIScreenmainScreen]bounds]; 自动适应父视图大小:=YES;=(UIViewAutoresizingFlexibleWidth| UIViewAutoresizingFlexibleHeight);  定义按钮UIButton*scaleUpButton=[UIButtonbuttonWithType:UIButtonTypeRoundedRect];[scaleUpButtonsetTitle:@"放大"forState:UIControlStateNormal];=CGRectMake(40,420,100,40);[scaleUpButtonaddTarget:selfaction:***@selector(scaleUp)forControlEvents:UIControlEventTouchUpInside]; 设置视图背景图片UIImageView*aView;[aViewsetImage:[UIImageimageNamed:@””]];=[UIColorcolorWithPatternImage:[UIImageimageNamed:@""]]; 自定义UISlider的样式和滑块我们使用的是UISlider的setMinimumTrackImage,和setMaximumTrackImage方法来定义图片的,这两个方法可以设置滑块左边和右边的图片的,不过如果用的是同一张图片且宽度和控件宽度基本一致,就不会有变形拉伸的后果,先看代码,写在viewDidLoad中://左右轨的图片UIImage*stetchLeftTrack=[UIImageimageNamed:@""];UIImage*stetchRigh