如何在導航欄的標題項上添加專輯選擇器視圖

Question

我想添加此功能來選擇我的導航欄的標題，然後查找顯示彈出式視圖，其中顯示另一個視圖。在Facebook的照片選擇器中發生了什麼。如何編程我的導航欄的標題以顯示此新視圖？

Answer 1

您應該設計自定義類的UIView，並設置下面的代碼：

#import "popoverView.h" 

@implementation popoverView 
- (void)drawRect:(CGRect)rect { 

    self.layer.cornerRadius=6.0; 
    CGFloat margian=20; 
    [self addpathAtPoint:CGPointMake(margian, margian) andEndPoint:CGPointMake(sqrtf(margian*margian+margian*margian), 0.0)]; 

    [self addpathAtPoint:CGPointMake(sqrtf(margian*margian+margian*margian), 0.0) andEndPoint:CGPointMake(2*margian, margian)]; 

    [self addpathAtPoint:CGPointMake(2*margian, margian) andEndPoint:CGPointMake(rect.size.width-2*margian, margian)]; 

    [self addCurveToPoint:CGPointMake(rect.size.width-2*margian, margian) endPoint:CGPointMake(rect.size.width-margian, 2*margian) controlPoint1:CGPointMake(rect.size.width-margian, margian) controlPoint2:CGPointMake(rect.size.width-margian, margian)]; 

    [self addpathAtPoint:CGPointMake(rect.size.width-margian, 2*margian) andEndPoint:CGPointMake(rect.size.width-margian, rect.size.height-2*margian)]; 

    [self addCurveToPoint:CGPointMake(rect.size.width-margian, rect.size.height-2*margian) endPoint:CGPointMake(rect.size.width-2*margian, rect.size.height-margian) controlPoint1:CGPointMake(rect.size.width-margian, rect.size.height-margian) controlPoint2:CGPointMake(rect.size.width-margian, rect.size.height-margian)]; 

    [self addpathAtPoint:CGPointMake(rect.size.width-2*margian, rect.size.height-margian) andEndPoint:CGPointMake(2*margian,rect.size.height-margian)]; 

    [self addCurveToPoint:CGPointMake(2*margian,rect.size.height-margian) endPoint:CGPointMake(margian,rect.size.height-2*margian) controlPoint1:CGPointMake(margian, rect.size.height-margian) controlPoint2:CGPointMake(margian, rect.size.height-margian)]; 

    [self addpathAtPoint:CGPointMake(margian,rect.size.height-2*margian) andEndPoint:CGPointMake(margian,margian)]; 
    } 

-(void)addpathAtPoint:(CGPoint)startPoint andEndPoint:(CGPoint)endPoint{ 
    UIBezierPath *path=[UIBezierPath bezierPath]; 
    path.lineWidth=3.0; 
    [path moveToPoint:startPoint]; 
    [path addLineToPoint:endPoint]; 
    [[UIColor blackColor] setStroke]; 
    [path stroke]; 
    [path closePath]; 
} 

-(void)addCurveToPoint:(CGPoint)startPoint endPoint:(CGPoint)endPoint controlPoint1:(CGPoint)controlPoint1 controlPoint2:(CGPoint)controlPoint2 
{ 
    UIBezierPath *path=[UIBezierPath bezierPath]; 
    path.lineWidth=3.0; 
    [path moveToPoint:startPoint]; 
    [path addCurveToPoint:endPoint controlPoint1:controlPoint1 controlPoint2:controlPoint2]; 
    [[UIColor blackColor]setStroke]; 
    [path stroke]; 

}