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ios雷达效果
这段时间新app开始了，有个产品需求是做一个类似如下效果的雷达图：
中间的图片是用户头像，然后需要展示一个雷达扫描的效果。
分析下雷达图的大致构成：
同时这个雷达图应该提供两个接口：开始动画，暂停动画。因此雷达图的.h文件暴露出来的接口如下：
@interface cpradarview : uiview - (void)start;//开始扫描 - (void)stop;//停止扫描 @end
.m文件实现如下：
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typedef ns_enum(nsuinteger, sectoranimationstatus) {//扇形视图动画状态
sectoranimationunstart,
sectoranimationisrunning,
sectoranimationispaused,
};
#define circlegap 15
@interface cpradarview ()
@property (nonatomic, strong) cpsectorview sectorview; //扇形视图
@property (nonatomic, assign) sectoranimationstatus status;
@end
@implementation cpradarview
- (instancetype)initwithframe:(cgrect)frame {
if(self = [super initwithframe:frame]) {
[self setupui];
_status = sectoranimationunstart;
}
return self;
}
- (void)setupui {
self.backgroundcolor = [uicolor whitecolor];
[self addsubview:({
cgrect temp = self.frame;
uiimageview imageview = [[uiimageview alloc] initwithframe:cgrectmake((temp.size.width - temp.size.width / 3.0) / 2.0, (temp.size.height - temp.size.width / 3.0) / 2.0, temp.size.width / 3.0, temp.size.width / 3.0)];
imageview.layer.cornerradius = temp.size.width / 6.0;
imageview.layer.maskstobounds = yes;
imageview.image = [uiimage imagenamed:@"hehe.jpg"];
imageview;
})];
[self addsubview:({
cgrect temp = self.frame;
_sectorview = [[cpsectorview alloc] initwithradius:temp.size.width / 6.0 + 4 circlegap degree:m_pi / 6];
cgrect frame = _sectorview.frame;
frame.origin.x = (self.frame.size.width - frame.size.width) / 2.0;
frame.origin.y = (self.frame.size.height - frame.size.height) / 2.0;
_sectorview.frame = frame;
_sectorview;
})];
}
- (void)start {
if (_status == sectoranimationunstart) {
_status = sectoranimationisrunning;
cabasicanimation rotationanimation;
rotationanimation = [cabasicanimation animationwithkeypath:@"transform.rotation.z"];
rotationanimation.tovalue = [nsnumber numberwithfloat: 2 m_pi ];
rotationanimation.duration = 5;
rotationanimation.cumulative = yes;
rotationanimation.removedoncompletion = no;
rotationanimation.repeatcount = maxfloat;
rotationanimation.fillmode = kcafillmodeforwards;
[_sectorview.layer addanimation:rotationanimation forkey:@"rotationanimation"];
}
if (_status == sectoranimationispaused) {
_status = sectoranimationisrunning;
[self resumelayer:_sectorview.layer];
}
}
- (void)stop {
_status = sectoranimationispaused;
[self pauselayer:_sectorview.layer];
}
/*
暂停动画
@param layer layer
/
-(void)pauselayer:(calayer)layer {
cftimeinterval pausedtime = [layer converttime:cacurrentmediatime() fromlayer:nil];
layer.speed = 0.0;
layer.timeoffset = pausedtime;
}
/*
恢复动画
@param layer layer
/
- (void)resumelayer:(calayer)layer {
cftimeinterval pausedtime = [layer timeoffset];
layer.speed = 1.0;
layer.timeoffset = 0.0;
layer.begintime = 0.0;
cftimeinterval timesincepause = [layer converttime:cacurrentmediatime() fromlayer:nil] - pausedtime;
layer.begintime = timesincepause;
}
/*
主要是用于画同心圆
@param rect rect
/
- (void)drawrect:(cgrect)rect {
cgcontextref context = uigraphicsgetcurrentcontext();
nsarray colors = @[[uicolor colorwithhexstring:@"ff4e7d"], [uicolor colorwithhexstring:@"fd7293"], [uicolor colorwithhexstring:@"fcb8cd"], [uicolor colorwithhexstring:@"fde9f2"], [uicolor colorwithhexstring:@"fcebf3"]];
cgfloat radius = rect.size.width / 6.0;
for (uicolor color in colors) {
cgfloat red, green, blue, alpha;
[color getred:&red green:&green blue:&blue alpha:&alpha];
cgcontextsetrgbstrokecolor(context, red, green, blue, alpha);
cgcontextsetlinewidth(context, 1);
cgcontextaddarc(context, rect.size.width / 2.0, rect.size.height / 2.0, radius, 0, 2* m_pi, 0);
cgcontextdrawpath(context, kcgpathstroke);
radius += circlegap;
}
}
其中cpsectorview 是定义的扇形视图，它什么都没干，只是将这个扇形画出来，其.h文件如下：
@interface cpsectorview : uiview - (instancetype)initwithradius:(cgfloat)radius degree:(cgfloat)degree; @end
radius 表示扇形的半径，degree表示扇形的弧度。其m文件如下：
@interface cpsectorview ()
@property (nonatomic, assign) cgfloat radius;
@property (nonatomic, assign) cgfloat degree;
@end
@implementation cpsectorview
- (instancetype)initwithradius:(cgfloat )radius degree:(cgfloat)degree {
self = [super initwithframe:cgrectmake(0, 0, 2 radius, 2 radius)];
if (self) {
_degree = degree;
_radius = radius;
}
self.backgroundcolor = [uicolor clearcolor];
return self;
}
- (void)drawrect:(cgrect)rect {
// cgcontextref context = uigraphicsgetcurrentcontext();
// uicolor *acolor = [uicolor colorwithhexstring:@"ff4e7d" alpha:0.5];
// cgcontextsetrgbstrokecolor(context, 1, 1, 1, 0);
// cgpoint center = cgpointmake(cgrectgetmidx(rect), cgrectgetmidy(rect));
// cgcontextsetfillcolorwithcolor(context, acolor.cgcolor);//填充颜色
//
// cgcontextmovetopoint(context, center.x, center.y);
// cgcontextaddarc(context,center.x, center.y, _radius, _degree / 2.0, -_degree / 2.0, 1);
// cgcontextclosepath(context);
// cgcontextdrawpath(context, kcgpathfillstroke); //绘制路径
cgcontextref ctx = uigraphicsgetcurrentcontext();
uigraphicsbeginimagecontext(rect.size);
cgcontextref imgctx = uigraphicsgetcurrentcontext();
cgpoint center = cgpointmake(cgrectgetmidx(rect), cgrectgetmidy(rect));
cgcontextmovetopoint(imgctx, center.x,center.y);
cgcontextsetfillcolor(imgctx, cgcolorgetcomponents([uicolor blackcolor].cgcolor));
cgcontextaddarc(imgctx, center.x, center.y, _radius, _degree / 2.0, -_degree / 2.0, 1);
cgcontextfillpath(imgctx);//画扇形遮罩
cgimageref mask = cgbitmapcontextcreateimage(uigraphicsgetcurrentcontext());
uigraphicsendimagecontext();
cgcontextcliptomask(ctx, self.bounds, mask);
cgfloat components[8]={
1.0, 0.306, 0.49, 0.5, //start color(r,g,b,alpha)
0.992, 0.937, 0.890, 0.5 //end color
};
//为扇形增加径向渐变色
cgcolorspaceref space = cgcolorspacecreatedevicergb();
cggradientref gradient = cggradientcreatewithcolorcomponents(space, components, null,2);
cgcolorspacerelease(space),space=null;//release
cgpoint start = center;
cgpoint end = center;
cgfloat startradius = 0.0f;
cgfloat endradius = _radius;
cgcontextref gractx = uigraphicsgetcurrentcontext();
cgcontextdrawradialgradient(gractx, gradient, start, startradius, end, endradius, 0);
cggradientrelease(gradient),gradient=null;//release
}
如果对扇形不做径向颜色渐变直接用注释的代码即可。具体代码就不解释了，注释和函数名字都很清晰。
以上就是对ios 雷达效果的资料整理，后续继续补充相关资料，谢谢大家对本站的支持！
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