我已经开始写一个UIView子类。这将是一个允许用户滚动块并按下其中任何一个的控件，非常类似于UITableView. 请检查我在下面发布的图片的链接。
http://i.piccy.info/i7/0577902c1bdba79ac3a26a5d3ce322f9/4-50-285/17627834/2012_12_12_14_06_11.jpg
http://i.piccy.info/i7/91a0a1eec95d74e7c13a789fc69a5582/4-50-285/20953097/2012_12_12_14_06_39.jpg
这是源代码：（.h 文件）
#import <UIKit/UIKit.h>
#import "Quartzcore/Quartzcore.h"
@interface OSBlockView : UIView
{
CGFloat scrollPosition; // from 0 to 1
CGFloat zoneForFlexion;
CGSize blockSize;
NSUInteger blockQuantity;
CGFloat projection;
NSDictionary *anglesForHeights;
CGFloat oldTranslatedY;
UIGestureRecognizer *panGesture;
NSArray *blocks;
}
@property (nonatomic, readwrite) CGFloat scrollPosition;
@property (nonatomic, readwrite) CGFloat zoneForFlexion;
@property (nonatomic, readwrite) CGSize blockSize;
@property (nonatomic, readwrite) NSUInteger blockQuantity;
@property (nonatomic, readwrite) CGFloat projection;
@property (nonatomic, retain) NSDictionary *anglesForHeights;
@property (nonatomic, readwrite) CGFloat oldTranslatedY;
@property (nonatomic, retain) UIGestureRecognizer *panGesture;
@property (nonatomic, retain) NSArray *blocks;
- (id)initWithFrame:(CGRect)frame blockHeight:(CGFloat)bHeight projection:(CGFloat)proj andBlocks:(NSArray *)blcks;
+(NSDictionary *)calculateAllHeightsForAnglesWithBlockHeight:(CGFloat)blockHeight andProjection:(CGFloat)proj;
-(NSNumber *)getBlockTopWithBlockNumber:(NSNumber *)bn;
-(NSNumber *)angleValueForBlockHeight:(NSNumber *)h;
+(NSArray *)multicoloredViewsWithSize:(CGSize)size;
@end
这是 .m 文件：
#import "OSBlockView.h"
@implementation OSBlockView
@synthesize scrollPosition, zoneForFlexion;
@synthesize blockSize, blockQuantity, projection;
@synthesize anglesForHeights;
@synthesize oldTranslatedY;
@synthesize panGesture;
@synthesize blocks;
int logForTimingIndex=0;
+(void)logFotTimingWithString:(NSString *)str
{
NSLog(@"time log: %08i %@", logForTimingIndex, str);
logForTimingIndex++;
}
- (id)initWithFrame:(CGRect)frame blockHeight:(CGFloat)bHeight projection:(CGFloat)proj andBlocks:(NSArray *)blcks;
{
[[self class] logFotTimingWithString:@"begin init"];
self = [super initWithFrame:frame];
if (self)
{
self.blockSize=CGSizeMake(frame.size.width, bHeight);
self.blockQuantity=[blcks count];
self.blocks=blcks;
self.projection=proj;
self.anglesForHeights=[OSBlockView calculateAllHeightsForAnglesWithBlockHeight:bHeight andProjection:proj];
self.scrollPosition=0.2;
self.zoneForFlexion=frame.size.height*0.9;
//adding pan gesture
self.panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanGesture:)];
[self addGestureRecognizer:panGesture];
};
[[self class] logFotTimingWithString:@"end init"];
return self;
}
+(NSArray *)multicoloredViewsWithSize:(CGSize)size
{
[[self class] logFotTimingWithString:@"multicoloredViewsWithSize begin"];
//generating multicoloured blocks
NSMutableArray *blocks=[[NSMutableArray alloc] init];
for (int i=0; i<13; i++)
{
UIColor *blockColor;
switch (i)
{
case 0:
{
blockColor=[UIColor colorWithRed:0.75 green:0.75 blue:0.75 alpha:1.0];
break;
}
case 1:
{
blockColor=[UIColor colorWithRed:0.5 green:0.5 blue:0.5 alpha:1.0];
break;
}
case 2:
{
blockColor=[UIColor colorWithRed:1.0 green:0.0 blue:0.0 alpha:1.0];
break;
}
case 3:
{
blockColor=[UIColor colorWithRed:0.5 green:0.0 blue:0.0 alpha:1.0];
break;
}
case 4:
{
blockColor=[UIColor colorWithRed:1.0 green:1.0 blue:0.0 alpha:1.0];
break;
}
case 5:
{
blockColor=[UIColor colorWithRed:0.5 green:0.5 blue:0.0 alpha:1.0];
break;
}
case 6:
{
blockColor=[UIColor colorWithRed:0.0 green:1.0 blue:0.0 alpha:1.0];
break;
}
case 7:
{
blockColor=[UIColor colorWithRed:0.0 green:0.5 blue:0.0 alpha:1.0];
break;
}
case 8:
{
blockColor=[UIColor colorWithRed:0.0 green:1.0 blue:1.0 alpha:1.0];
break;
}
case 9:
{
blockColor=[UIColor colorWithRed:0.0 green:0.5 blue:0.5 alpha:1.0];
break;
}
case 10:
{
blockColor=[UIColor colorWithRed:0.0 green:0.0 blue:1.0 alpha:1.0];
break;
}
case 11:
{
blockColor=[UIColor colorWithRed:0.0 green:0.0 blue:0.5 alpha:1.0];
break;
}
case 12:
{
blockColor=[UIColor colorWithRed:1.0 green:0.0 blue:1.0 alpha:1.0];
break;
}
case 13:
{
blockColor=[UIColor colorWithRed:0.5 green:0.0 blue:0.5 alpha:1.0];
break;
}
default:
{
NSLog(@"PANIC: unknown block index");
blockColor=[UIColor blackColor];
break;
}
}
UIView *bView=[[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, size.width, size.height)];
[bView setBackgroundColor:blockColor];
[bView.layer setBorderWidth:3];
[bView.layer setBorderColor:[[UIColor whiteColor] CGColor]];
UILabel *blockLabel=[[UILabel alloc] initWithFrame:CGRectMake(2.5, 2.5, bView.frame.size.width-5, bView.frame.size.height-5)];
[blockLabel setBackgroundColor:[UIColor clearColor]];
[blockLabel setText:[NSString stringWithFormat:@"block number %i", i]];
[blockLabel setFont:[UIFont boldSystemFontOfSize:20]];
[blockLabel setTextColor:[UIColor whiteColor]];
[blockLabel setTextAlignment:UITextAlignmentCenter];
[bView addSubview:blockLabel];
[blocks addObject:bView];
};
[[self class] logFotTimingWithString:@"multicoloredViewsWithSize end"];
return blocks;
}
- (void)drawRect:(CGRect)rect
{
//NSLog(@"\n\n\n\n\n\n\n\n\n");
[[self class] logFotTimingWithString:@"drawRect begin"];
//NSLog(@"drawRect called");
//NSLog(@"self.subview.count: %i", [self.subviews count]);
//[[self class] logFotTimingWithString:@"subviews remove begin"];
for (UIView* subview in self.subviews)
{
//NSLog(@"subview removed");
[subview removeFromSuperview];
};
//[[self class] logFotTimingWithString:@"subviews remove end"];
//calculating top coordinates of blocks
//NSLog(@"calculating block tops...");
//[[self class] logFotTimingWithString:@"calculating block tops begin"];
NSMutableArray *blockTops=[[NSMutableArray alloc] init];
for (unsigned int blockCounter=0; blockCounter<blockQuantity; blockCounter++)
{
[blockTops addObject:[self getBlockTopWithBlockNumber:[NSNumber numberWithInt:blockCounter]]];
};
//[[self class] logFotTimingWithString:@"calculating block tops end"];
/*
for (unsigned int index=0; index!=[blockTops count]; index++)
{
NSLog(@"top %i at %i", index, [[blockTops objectAtIndex:index] intValue]);
};
*/
//calculating block heights
//NSLog(@"calculating block heights...");
//[[self class] logFotTimingWithString:@"calculating block heights begin"];
NSMutableArray *blockHeights=[[NSMutableArray alloc] init];
for (unsigned int index=0; index<[blockTops count]; index++)
{
if (([blockTops count]-1)!=index)
{
[blockHeights addObject:[NSNumber numberWithInt:([[blockTops objectAtIndex:(index+1)] intValue]-[[blockTops objectAtIndex:index] intValue])]];
}
else
{
if ((self.frame.size.height-[[blockTops objectAtIndex:index] intValue])<blockSize.height)
{
[blockHeights addObject:[NSNumber numberWithInt:(self.frame.size.height-[[blockTops objectAtIndex:index] intValue])]];
}
else
{
[blockHeights addObject:[NSNumber numberWithInt:blockSize.height]];
};
};
};
//[[self class] logFotTimingWithString:@"calculating block heights end"];
for (unsigned int blockCounter=0; blockCounter<blockQuantity; blockCounter++)
{
//NSLog(@"\n\n");
//[[self class] logFotTimingWithString:@"draw cycle begin"];
//[self preLoadBlockAtY:[blockTops objectAtIndex:blockCounter] withHeight:[blockHeights objectAtIndex:blockCounter] andIndex:[NSNumber numberWithUnsignedInt:blockCounter]];
//NSLog(@" preLoadingSampleBlockAtY: %g withHeight: %g andIndex: %i", [y doubleValue], [height doubleValue], [index unsignedIntValue]);
NSNumber *y=[blockTops objectAtIndex:blockCounter];
NSNumber *height=[blockHeights objectAtIndex:blockCounter];
//NSNumber *index=[NSNumber numberWithUnsignedInt:blockCounter];
//NSLog(@"loading block %02u y:%g h:%g", [index unsignedIntValue], [y doubleValue], [height doubleValue]);
if ([height intValue]>2)
{
BOOL up;
if ([y doubleValue]>self.frame.size.height/2.0)
{
up=true;
}
else
{
up=false;
};
//[[self class] logFotTimingWithString:@"bview init begin"];
UIView *bView=[NSKeyedUnarchiver unarchiveObjectWithData:[NSKeyedArchiver archivedDataWithRootObject:[blocks objectAtIndex:blockCounter]]];
[bView setFrame:CGRectMake(0.0, [y doubleValue], self.frame.size.width, blockSize.height)];
//[bView.layer setMasksToBounds:YES];
//[[self class] logFotTimingWithString:@"bview init end"];
//NSLog(@" blockImage frame y: %g", blockImage.frame.origin.y);
//NSLog(@" blockImage frame height: %g", blockImage.frame.size.height);
double oldHeight=bView.frame.size.height;
//NSLog(@" preanchor: %@", NSStringFromCGRect(bView.frame));
//[[self class] logFotTimingWithString:@"bview anchor begin"];
//setting anchor point
if (up)
{
[bView.layer setAnchorPoint:CGPointMake(0.5, 1.0)];
[bView setFrame:CGRectMake(bView.frame.origin.x, bView.frame.origin.y+bView.frame.size.height/2.0, bView.frame.size.width, bView.frame.size.height)];
}
else
{
[bView.layer setAnchorPoint:CGPointMake(0.5, 0.0)];
[bView setFrame:CGRectMake(bView.frame.origin.x, bView.frame.origin.y-bView.frame.size.height/2.0, bView.frame.size.width, bView.frame.size.height)];
};
//[[self class] logFotTimingWithString:@"bview anchor end"];
//NSLog(@" postanchor: %@", NSStringFromCGRect(bView.frame));
//[[self class] logFotTimingWithString:@"bview transform begin"];
if ([height doubleValue]!=blockSize.height)
{
//preparing transform
CATransform3D basicTrans = CATransform3DIdentity;
basicTrans.m34 =1.0/-projection;
//calculating angle
double angle= [[self angleValueForBlockHeight:height] doubleValue];
double rangle;
if (up)
{
rangle=angle/360*(2.0*M_PI);
}
else
{
rangle=(360.0-angle)/360*(2.0*M_PI);
};
//NSLog(@" angle: %g", angle);
//transforming
bView.layer.transform = CATransform3DRotate(basicTrans, rangle, 1.0f, 0.0f, 0.0f);
//NSLog(@" blockImage frame y: %g", blockImage.frame.origin.y);
//NSLog(@" blockImage frame height: %g", blockImage.frame.size.height);
};
//[[self class] logFotTimingWithString:@"bview transform end"];
//[[self class] logFotTimingWithString:@"bview post transform begin"];
double newHeight=bView.frame.size.height;
if (up)
{
[bView setCenter:CGPointMake(bView.center.x, bView.center.y-(oldHeight-newHeight))];
};
//NSLog(@" blockImage frame y: %g", bView.frame.origin.y);
//NSLog(@" blockImage frame height: %g", bView.frame.size.height);
//adding subview
[self addSubview:bView];
//[[self class] logFotTimingWithString:@"bview post transform end"];
}
else
{
//do not need to draw blocks with very low height
};
//[[self class] logFotTimingWithString:@"draw cycle end"];
//NSLog(@"\n\n");
};
[[self class] logFotTimingWithString:@"drawRect end"];
//NSLog(@"\n\n\n\n\n\n\n\n\n\n");
}
-(NSNumber *)angleValueForBlockHeight:(NSNumber *)h
{
//[[self class] logFotTimingWithString:@" angleValueForBlockHeight begin"];
//NSLog(@"angleValueForBlockHeight: %g called", [h doubleValue]);
//searching for closest key
double minDistance=blockSize.height;
double distance;
NSString *minKey=@"";
for(NSString *key in anglesForHeights)
{
if ([[anglesForHeights objectForKey:key] doubleValue]==[h doubleValue])
{
//match found
//NSLog(@"returned: %g", [key doubleValue]);
return [NSNumber numberWithDouble:[key doubleValue]];
};
distance=fabs([[anglesForHeights objectForKey:key] doubleValue]-[h doubleValue]);
if (distance<minDistance)
{
minDistance=distance;
minKey=key;
};
};
//NSLog(@"returned: %g", [blockSizesForAngles objectForKey:minKey]);
//[[self class] logFotTimingWithString:@" angleValueForBlockHeight end"];
return [NSNumber numberWithDouble:[minKey doubleValue]];
}
+(NSDictionary *)calculateAllHeightsForAnglesWithBlockHeight:(CGFloat)blockHeight andProjection:(CGFloat)proj
{
//NSLog(@"calculateAllHeightsForAnglesWithBlockHeight:%g andProjection:%g called", blockHeight, proj);
//[[self class] logFotTimingWithString:@" calculateAllHeightsForAnglesWithBlockHeight:andProjection begin"];
NSMutableDictionary *res=[[NSMutableDictionary alloc] init];
for (double i=0.0; i<=90.0; i=i+1.0)
{
//NSLog(@"i: %g", i);
UIView *block=[[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, 100.0, blockHeight)];
[block.layer setAnchorPoint:CGPointMake(0.5, 1.0)];
CATransform3D basicTrans = CATransform3DIdentity;
double rangle;
basicTrans.m34 =1.0/-proj;
rangle=i/360*(2.0*M_PI);
//NSLog(@"rangle: %g Pi", rangle/M_PI);
block.layer.transform = CATransform3DRotate(basicTrans, rangle, 1.0f, 0.0f, 0.0f);
//NSLog(@"calculated block height: %g for angle: %g", block.frame.size.height, i);
if ([res objectForKey:[NSString stringWithFormat:@"%i", (int)roundf(i)]]==nil)
{
[res setObject:[NSString stringWithFormat:@"%i", (int)floor(block.frame.size.height)] forKey:[NSNumber numberWithDouble:i]];
};
};
//NSLog(@" result (size: %i): %@", [res count], [res debugDescription]);
//[[self class] logFotTimingWithString:@" calculateAllHeightsForAnglesWithBlockHeight:andProjection end"];
return [NSDictionary dictionaryWithDictionary:res];
}
-(NSNumber *)getBlockTopWithBlockNumber:(NSNumber *)bn
{
//NSLog(@"getBlockTopWithBlockNumber: %i", [bn intValue]);
//[[self class] logFotTimingWithString:@" getBlockTopWithBlockNumber begin"];
int t=[bn intValue];
CGFloat h=self.blockSize.height;
float v = self.blockQuantity * h - self.zoneForFlexion;
float vp = v * self.scrollPosition;
float z = t * h;
float alpha = (self.frame.size.height-self.zoneForFlexion) / (self.scrollPosition*self.scrollPosition + (1-self.scrollPosition) * (1-self.scrollPosition));
float f;
if (z < vp)
{
f = z / v;
//NSLog(@" %i", (int)(alpha * (f * f)));
//[[self class] logFotTimingWithString:@" getBlockTopWithBlockNumber end"];
return [NSNumber numberWithInt:(int)(alpha * (f * f))];
};
if (z <= vp + self.zoneForFlexion)
{
//NSLog(@" %i", (int)(z + alpha * (self.scrollPosition * self.scrollPosition) - vp));
//[[self class] logFotTimingWithString:@" getBlockTopWithBlockNumber end"];
return [NSNumber numberWithInt:(int)(z + alpha * (self.scrollPosition * self.scrollPosition) - vp)];
}
else
{
f = (blockQuantity*h-z) / v;
//NSLog(@" %i", (int)(self.frame.size.height - alpha * (f * f)));
//[[self class] logFotTimingWithString:@" getBlockTopWithBlockNumber end"];
return [NSNumber numberWithInt:(int)(self.frame.size.height - alpha * (f * f))];
};
}
double oldTranslatedY=0.0;
-(IBAction)handlePanGesture:(UIPanGestureRecognizer *)sender
{
//NSLog(@"handlePanGesture: called");
//[[self class] logFotTimingWithString:@" handlePanGesture begin"];
double translatedY = [sender translationInView:self].y;
double delta;
if (fabs(translatedY)<fabs(oldTranslatedY))
{
[sender setTranslation:CGPointZero inView:self];
oldTranslatedY=0.0;
delta=0.0;
}
else
{
delta=translatedY-oldTranslatedY;
oldTranslatedY=translatedY;
};
//NSLog(@"translatedY: %g", translatedY);
double pOffset=delta/((blockQuantity*blockSize.height)-self.frame.size.height);
self.scrollPosition=self.scrollPosition-pOffset;
if (self.scrollPosition<0.0)
{
self.scrollPosition=0.0;
}
else if(self.scrollPosition>1.0)
{
self.scrollPosition=1.0;
};
[[self class] logFotTimingWithString:@" handlePanGesture end"];
[self setNeedsDisplay];
}
在模拟器上一切正常。但是在真机上速度太慢了。
我在两件事上需要帮助：
在绘制块的那一刻：如果我知道块应该具有什么高度值，我如何计算用于旋转块以适应高度的角度？它还取决于投影值。现在它正在使用一个丑陋的解决方案，在视图初始化并保存到字典后预先计算所有角度（从 0 到 90）的高度，当我们需要知道块旋转以适应高度的特定角度时，我们只需搜索此硬编码字典中最接近的高度值并使用适当的角度。太丑了 我试图通过在绘图期间计算所需的值来避免这种情况，但我没有运气（需要公式）。
其他部分的优化。
请帮助我，我一直在解决这个问题。