iOS实现波浪效果

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本文实例为大家分享了ios实现波浪效果的具体代码，供大家参考，具体内容如下

iOS实现波浪效果

代码：

									@interface viewcontroller () 

									@property (strong, nonatomic) cadisplaylink *displaylink;

									@property (strong, nonatomic) cashapelayer *shapelayer;

									@property (strong, nonatomic) uibezierpath *path;

									@property (strong, nonatomic) cashapelayer *shapelayer2;

									@property (strong, nonatomic) uibezierpath *path2;

									@end

									@implementation viewcontroller

									- (void)viewdidload {

									 [super viewdidload]; 

									 _shapelayer = [cashapelayer layer];

									 _shapelayer.frame = cgrectmake(0, 100, 375, 150);

									 [self.view.layer addsublayer:_shapelayer];

									 _shapelayer2 = [cashapelayer layer];

									 _shapelayer2.frame = cgrectmake(0, 100, 375, 150);

									 [self.view.layer addsublayer:_shapelayer2];

									 _shapelayer.fillcolor = [[uicolor yellowcolor] colorwithalphacomponent:0.3].cgcolor;

									 _shapelayer2.fillcolor = [[uicolor bluecolor] colorwithalphacomponent:0.3].cgcolor; 

									 _displaylink = [cadisplaylink displaylinkwithtarget:self selector:@selector(drawpath)];

									 [_displaylink addtorunloop:[nsrunloop mainrunloop] formode:nsrunloopcommonmodes]; 

									} 

									- (void)drawpath {

									 static double i = 0;

									 cgfloat a = 10.f;//a振幅

									 cgfloat k = 0;//y轴偏移

									 cgfloat ω = 0.03;//角速度ω变大，则波形在x轴上收缩（波形变紧密）；角速度ω变小，则波形在x轴上延展（波形变稀疏）。不等于0

									 cgfloat φ = 0 + i;//初相，x=0时的相位；反映在坐标系上则为图像的左右移动。

									 //y=asin(ωx+φ)+k 

									 _path = [uibezierpath bezierpath];

									 _path2 = [uibezierpath bezierpath]; 

									 [_path movetopoint:cgpointzero];

									 [_path2 movetopoint:cgpointzero];

									 for (int i = 0; i < 376; i ++) {

									  cgfloat x = i;

									  cgfloat y = a * sin(ω*x+φ)+k;

									  cgfloat y2 = a * cos(ω*x+φ)+k;

									  [_path addlinetopoint:cgpointmake(x, y)];

									  [_path2 addlinetopoint:cgpointmake(x, y2)];

									 }

									 [_path addlinetopoint:cgpointmake(375, -100)];

									 [_path addlinetopoint:cgpointmake(0, -100)];

									 _path.linewidth = 1;

									 _shapelayer.path = _path.cgpath; 

									 [_path2 addlinetopoint:cgpointmake(375, -100)];

									 [_path2 addlinetopoint:cgpointmake(0, -100)];

									 _path2.linewidth = 1;

									  _shapelayer2.path = _path2.cgpath;

									 i += 0.1;

									 if (i > m_pi * 2) {

									  i = 0;//防止i越界

									 }

									}