iphone 开发笔记
退回输入键盘
- (BOOL) textFieldShouldReturn:(id)textField{
[textField resignFirstResponder];
}
CGRect
CGRect frame = CGRectMake (origin.x, origin.y, size.width, size.height);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 & CGSize
CGPoint aPoint = CGPointMake(x, y);
CGSize aSize = CGSizeMake(width, height);
设置透明度
[myView setAlpha:value];
(0.0 < value < 1.0)
设置背景色
[myView setBackgroundColor:[UIColor redColor]];
(blackColor;darkGrayColor;lightGrayColor;
whiteColor;grayColor; redColor; greenColor;
blueColor; cyanColor;yellowColor;
magentaColor;orangeColor;purpleColor;
brownColor; clearColor; )
自定义颜色
UIColor *newColor = [[UIColor alloc]
initWithRed:(float) green:(float) blue:(float) alpha:(float)];
0.0~1.0
竖屏
320X480
横屏
480X320
状态栏高
(显示时间和网络状态)
20 像素