我正在尝试为加速度计使用实现此代码，但我收到编译器错误： stray / 342，stray / 200 ... for size，currentTouch，position object's等等...... 为什么呢？
code:
//GravityObj.h
@interface GravityObj : UIView {
CGPoint position;
CGSize size;
CGPoint velocity;
NSTimer *objTimer;
NSString *pngName;
CGFloat bounce;
CGFloat gravity;
CGPoint acceleratedGravity;
CGPoint lastTouch;
CGPoint currentTouch;
BOOL dragging;
}
@property CGPoint position;
@property CGSize size;
@property CGPoint velocity;
@property(nonatomic,retain)NSString *pngName;
@property(nonatomic,retain)NSTimer *objTimer;
@property CGFloat bounce;
@property CGFloat gravity;
@property CGPoint acceleratedGravity;
@property CGPoint lastTouch;
@property CGPoint currentTouch;
@property BOOL dragging;
- (id)initWithPNG:(NSString*)imageName position:(CGPoint)p size:(CGSize)s;
- (void)update;
- (void)onTimer;
@end
//GravityObj.m
#import "GravityObj.h"
@implementation GravityObj
@synthesize position, size;
@synthesize objTimer;
@synthesize velocity;
@synthesize pngName;
@synthesize bounce;
@synthesize gravity, acceleratedGravity;
@synthesize lastTouch, currentTouch;
@synthesize dragging;
- (id)initWithPNG:(NSString*)imageName position:(CGPoint)p size:(CGSize)s {
if (self = [super initWithFrame:CGRectMake(p.x, p.y, s.width, s.height)]) {
[self setPngName:imageName];
[self setPosition:p];
[self setSize:s];
[self setBackgroundColor:[UIColor clearColor]];
// Set default gravity and bounce
[self setBounce:-0.9f];
[self setGravity:0.5f];
[self setAcceleratedGravity:CGPointMake(0.0, gravity)];
[self setDragging:NO];
UIImageView *prezzie = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, s.width, s.height)];
prezzie.image = [UIImage imageNamed:imageName];
[self addSubview:prezzie];
[prezzie release];
[[UIAccelerometer sharedAccelerometer] setDelegate:self];
}
return self;
}
- (void)update {
[self setNeedsDisplay];
if(dragging) return;
velocity.x += acceleratedGravity.x;
velocity.y += acceleratedGravity.y;
position.x += velocity.x;
position.y += velocity.y;
if(position.x + size.width >= 320.0) {
position.x = 320.0 – size.width;
velocity.x *= bounce;
}
else if(position.x <= 0.0) {
velocity.x *= bounce;
}
if(position.y + size.height >= 416.0) {
position.y = 416.0 – size.height;
velocity.y *= bounce;
}
else if(position.y <= 0.0) {
velocity.y *= bounce;
}
self.frame = CGRectMake(position.x, position.y, size.width, size.height);
}
- (void)onTimer {
[self update];
}
- (void)drawRect:(CGRect)rect {
// Drawing code
}
/* EVENTS */
- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
acceleratedGravity.x = acceleration.x * gravity;
acceleratedGravity.y = -acceleration.y * gravity;
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
// First, lets check to make sure the timer has been initiated
if (objTimer == nil) {
objTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 / 30.0 target:self selector:@selector(onTimer) userInfo:nil repeats:YES];
}
UITouch *touch = [touches anyObject];
[self setCurrentTouch:[touch locationInView:self]];
CGFloat dx = currentTouch.x – position.x;
CGFloat dy = currentTouch.y – position.y;
CGFloat dist = sqrt(dx * dx + dy * dy);
if(dist < size.width) {
[self setVelocity:CGPointMake(0.0, 0.0)];
[self setDragging:YES];
}
[self setLastTouch:currentTouch];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
[self setCurrentTouch:[touch locationInView:self]];
[self setDragging:YES];
[self setVelocity:CGPointMake(currentTouch.x – lastTouch.x, currentTouch.y – lastTouch.y)];
[self setLastTouch:currentTouch];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
[self setDragging:NO];
}
- (void)dealloc {
[objTimer release], objTimer = nil;
[pngName release], pngName = nil;
[super dealloc];
}
@end
答案 0 :(得分：4)
看起来你的某些行中的减号是Unicode字符，显示为minus而不是。我将你的代码复制到Xcode中并得到了同样的错误。然后我重新输入了有错误的每一行并且它有效。
这是固定版本（仅限.m文件）：
@implementation GravityObj
@synthesize position, size;
@synthesize objTimer;
@synthesize velocity;
@synthesize pngName;
@synthesize bounce;
@synthesize gravity, acceleratedGravity;
@synthesize lastTouch, currentTouch;
@synthesize dragging;
- (id)initWithPNG:(NSString*)imageName position:(CGPoint)p size:(CGSize)s {
if (self = [super initWithFrame:CGRectMake(p.x, p.y, s.width, s.height)]) {
[self setPngName:imageName];
[self setPosition:p];
[self setSize:s];
[self setBackgroundColor:[UIColor clearColor]];
// Set default gravity and bounce
[self setBounce:-0.9f];
[self setGravity:0.5f];
[self setAcceleratedGravity:CGPointMake(0.0, gravity)];
[self setDragging:NO];
UIImageView *prezzie = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, s.width, s.height)];
prezzie.image = [UIImage imageNamed:imageName];
[self addSubview:prezzie];
[prezzie release];
[[UIAccelerometer sharedAccelerometer] setDelegate:self];
}
return self;
}
- (void)update {
[self setNeedsDisplay];
if(dragging) return;
velocity.x += acceleratedGravity.x;
velocity.y += acceleratedGravity.y;
position.x += velocity.x;
position.y += velocity.y;
if(position.x + size.width >= 320.0) {
position.x = 320.0 - size.width;
velocity.x *= bounce;
}
else if(position.x <= 0.0) {
velocity.x *= bounce;
}
if(position.y + size.height >= 416.0) {
position.y = 416.0 - size.height;
velocity.y *= bounce;
}
else if(position.y <= 0.0) {
velocity.y *= bounce;
}
self.frame = CGRectMake(position.x, position.y, size.width, size.height);
}
- (void)onTimer {
[self update];
}
- (void)drawRect:(CGRect)rect {
// Drawing code
}
/* EVENTS */
- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
acceleratedGravity.x = acceleration.x * gravity;
acceleratedGravity.y = -acceleration.y * gravity;
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
// First, lets check to make sure the timer has been initiated
if (objTimer == nil) {
objTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 / 30.0 target:self selector:@selector(onTimer) userInfo:nil repeats:YES];
}
UITouch *touch = [touches anyObject];
[self setCurrentTouch:[touch locationInView:self]];
CGFloat dx = currentTouch.x - position.x;
CGFloat dy = currentTouch.y - position.y;
CGFloat dist = sqrt(dx * dx + dy * dy);
if(dist < size.width) {
[self setVelocity:CGPointMake(0.0, 0.0)];
[self setDragging:YES];
}
[self setLastTouch:currentTouch];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
[self setCurrentTouch:[touch locationInView:self]];
[self setDragging:YES];
[self setVelocity:CGPointMake(currentTouch.x - lastTouch.x, currentTouch.y - lastTouch.y)];
[self setLastTouch:currentTouch];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
[self setDragging:NO];
}
- (void)dealloc {
[objTimer release], objTimer = nil;
[pngName release], pngName = nil;
[super dealloc];
}
@end
如果再次出现该错误，我发现在FileMerge中查看该文件可以提供帮助;它似乎不知道Unicode和Xcode。
答案 1 :(得分：0)
您通常可以从pdf（有时是html）复制/粘贴中拾取stray / 342/200。粘贴到终端并复制回来以便快速修复。
答案 2 :(得分：0)
是的，我也遇到过这种类型的错误，可以通过删除一些不需要的格式化行空间来解决，例如灰色聚焦线，这些行复制了您从其他网站或网页或PDF文件复制的代码内容。它肯定会删除这些类型的错误，删除额外的格式化的行或只是将代码部分复制粘贴到记事本和原始文本副本回到您的代码..完成。!!!