iOS 環形進度條

1、首先先將自定義的view和進度條的值關聯起來

- (ibaction)progresschange:(uislider *)sender

cgfloat radius = rect.size.width / 2;

cgpoint center  = cgpointmake(rect.size.width/2, rect.size.height/2);
//-m_pi_2由3點鐘方向調整到12點鐘方向
cgfloat
end = -m_pi_2 + self.progress * m_pi * 2;
uibezierpath *bezier = [uibezierpath
bezierpathwitharccenter:center radius:radius-2
startangle:-m_pi_2
endangle:
endclockwise:
yes];
[bezier stroke];

-(void)setprogress:(cgfloat)progress

完整**：

#import "drawprogressvc.h"

@inte***ce
drawprogressview
:uiview
@property (nonatomic,assign) cgfloat progress;
@end
@implementation
drawprogressview
-(void)setprogress:(cgfloat)progress
//不能手動呼叫drawrect方法，因為只有在drawrect裡才能拿到上下文，圖形上下文只能由系統建立
- (void)drawrect:(cgrect)rect
@end
@inte***ce
drawprogressvc ()
@property (weak, nonatomic) iboutlet
uilabel *valuelabel;
@property (weak, nonatomic) iboutlet
drawprogressview *progressview;
@end
@implementation
drawprogressvc
- (void)viewdidload 
- (ibaction)progresschange:(uislider *)sender 
- (void)didreceivememorywarning 
@end

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