function isIE(){ //判断是否是ie
if (window.navigator.userAgent.toString().toLowerCase().indexOf("msie") >=1)
return true;
else
return false;
}
if(!isIE()){ //firefox innerText define
HTMLElement.prototype.__defineGetter__( "innerText",
function(){
var anyString = "";
var childS = this.childNodes;
for(var i=0; i <childS.length; i++) {
if(childS[i].nodeType==1)
anyString += childS[i].tagName=="BR" ? '\n' : childS[i].innerText;
else if(childS[i].nodeType==3)
anyString += childS[i].nodeValue;
}
return anyString;
}
);
HTMLElement.prototype.__defineSetter__( "innerText",
function(sText){
this.textContent=sText;
}
);
}
1. int
输出格式符：%i, %d, %o %x,2. float
输出格式符：%f, %e, %g
3. double
输出格式符：%f, %e, %g
输出格式符：%c
限定符：
1. long
long int: %li
long double: %Lf
形成long int通过在数字后面加L.
long int number = 123324123234123L;
2. long long
long long int: %lli
3. short
short int: %hi
4. unsigned
5. signed
它们各自所占的字节数
#import <Foundation/Foundation.h>
int main (int argc, const char * argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
NSLog(@"The size of an int is: %d bytes.",sizeof(int));
NSLog(@"The size of a short int is: %d bytes.",sizeof(short int));
NSLog(@"The size of a long int is: %d bytes.",sizeof(long int));
NSLog(@"The size of a char is: %d bytes.",sizeof(char));
NSLog(@"The size of a float is: %d bytes.",sizeof(float));
NSLog(@"The size of a double is: %d bytes.",sizeof(double));
NSLog(@"The size of a bool is: %d bytes.",sizeof(bool));
[pool drain];
return 0;
}
2011-08-21 09:29:16.475 sizeofTest[860:903] The size of an int is: 4 bytes.
2011-08-21 09:29:16.478 sizeofTest[860:903] The size of a short int is: 2 bytes.
2011-08-21 09:29:16.478 sizeofTest[860:903] The size of a long int is: 8 bytes.
2011-08-21 09:29:16.479 sizeofTest[860:903] The size of a char is: 1 bytes.
2011-08-21 09:29:16.479 sizeofTest[860:903] The size of a float is: 4 bytes.
2011-08-21 09:29:16.479 sizeofTest[860:903] The size of a double is: 8 bytes.
2011-08-21 09:29:16.480 sizeofTest[860:903] The size of a bool is: 1 bytes.
logout
转自：http://www.cnblogs.com/getsun/archive/2011/08/21/2147618.html
头文件：
#import <UIKit/UIKit.h>
#include <math.h>
static inline double radians(double degrees) {
return degrees * M_PI / 180;
}
#define FontSize 20.0f
@interface DrawScreen : UIView {
}
- (void)drawTextByString:(NSString *)drawText thePoisition:(CGPoint)point;
- (void)drawPicByImage:(UIImage *)theImage theRect:(CGRect)rect;
- (void)drawTextByQuartz:(CGContextRef)context theText:(const char *)drawtext
thePoisition:(CGPoint)point rotateAngle:(float)angle;
- (void)drawPicByQuartz:(CGContextRef)context thePic:(UIImage *)theImage theLocation:(CGRect)rect;
@end
实现文件：
#import "DrawScreen.h"
@implementation DrawScreen
- (id)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
self.backgroundColor = [UIColor blackColor];
}
return self;
}
- (void)drawRect:(CGRect)rect {
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [UIColor greenColor].CGColor);
//方式一：用NSString的方式画字，用UIImage的方式画图片，坐标原点在左上角
NSString *textOne = [NSString stringWithFormat:@"iPad"];
NSString *textTwo = [NSString stringWithFormat:@"iPhone"];
[self drawTextByString:textOne thePoisition:CGPointMake(50.0f, 260.0f)];
[self drawTextByString:textTwo thePoisition:CGPointMake(250.0f, 260.0f)];
UIImage *flagOne = [UIImage imageNamed:@"flag.png"];
[self drawPicByImage:flagOne theRect:CGRectMake(50.0f, 200.0f, 45.0f, 45.0f)];
[self drawPicByImage:flagOne theRect:CGRectMake(250.0f, 200.0f, 45.0f, 45.0f)];
//方式二：用Quartz2D的方式画字和图片，坐标原点移动到左下角
CGContextTranslateCTM(context, 0, self.bounds.size.height);
CGContextScaleCTM(context, 1, -1);
UIImage *flagTwo = [UIImage imageNamed:@"location.png"];
[self drawTextByQuartz:context theText:"Apple" thePoisition:CGPointMake(160.0f, 200.0f) rotateAngle:45.0f];
[self drawTextByQuartz:context theText:"iPod" thePoisition:CGPointMake(50.0f, 100.0f) rotateAngle:45.0f];
[self drawTextByQuartz:context theText:"iMac" thePoisition:CGPointMake(250.0f, 100.0f) rotateAngle:45.0f];
[self drawPicByQuartz:context thePic:flagTwo theLocation:CGRectMake(160.0f, 230.0f, 50.0f, 50.0f)];
[self drawPicByQuartz:context thePic:flagTwo theLocation:CGRectMake(50.0f, 130.0f, 50.0f, 50.0f)];
[self drawPicByQuartz:context thePic:flagTwo theLocation:CGRectMake(250.0f, 130.0f, 50.0f, 50.0f)];
}
- (void)dealloc {
[super dealloc];
}
- (void)drawTextByString:(NSString *)drawText thePoisition:(CGPoint)point {
//方式一
[drawText drawAtPoint:point withFont:[UIFont systemFontOfSize:FontSize]];
}
- (void)drawPicByImage:(UIImage *)theImage theRect:(CGRect)rect {
//方式一
[theImage drawInRect:rect];
}
- (void)drawTextByQuartz:(CGContextRef)context theText:(const char *)drawtext
thePoisition:(CGPoint)point rotateAngle:(float)angle {
//方式二
CGContextSelectFont(context, "Helvetica", FontSize, kCGEncodingMacRoman);
CGContextSetTextDrawingMode(context, kCGTextFill);
CGAffineTransform myTextTransform = CGAffineTransformMakeRotation(radians(angle));
CGContextSetTextMatrix (context, myTextTransform);
CGContextShowTextAtPoint(context, point.x, point.y, drawtext, strlen(drawtext));
}
- (void)drawPicByQuartz:(CGContextRef)context thePic:(UIImage *)theImage theLocation:(CGRect)rect {
//方式二
CGContextDrawImage(context, rect, theImage.CGImage);
}
@end
示例图：