IOS 6自定义UIView由paintcode

Question

我是一个IOS初学者。

我试图用paintcode生成的代码显示自定义按钮。 我在故事板上拖动一个视图，然后将此通用视图类设置为我的自定义视图“GreenButton”。当我运行该应用程序时，该按钮不显示。我添加了NSLogs，并可以看到drawRect方法成功运行。

paintcode生成的代码似乎包括绘制按钮的所有内容。我只是使用XCode来调整我的视图。

我是否需要实现initWithFrame方法？

// 
// GreenButton.m 
// Test 
// 
// Created by Tim on 13.04.2013. 
// Copyright (c) 2013 Tim. All rights reserved. 
// 

#import "GreenButton.h" 

@implementation GreenButton 

- (id)initWithFrame:(CGRect)frame { 
    self = [super initWithFrame:frame]; 
    if (self) { 
     // setup the initial properties of the view 

    } 
    return self; 

} 

#pragma mark - Touch event overrides 


// Only override drawRect: if you perform custom drawing. 
// An empty implementation adversely affects performance during animation. 
- (void)drawRect:(CGRect)rect 
{ 
    NSLog(@"drawRect enter"); 
    //// General Declarations 
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); 
    CGContextRef context = UIGraphicsGetCurrentContext(); 

    //// Color Declarations 
    UIColor* strokeColor = [UIColor colorWithRed: 0.419 green: 0.434 blue: 0.455 alpha: 1]; 
    UIColor* baseColor = [UIColor colorWithRed: 0.218 green: 0.24 blue: 0.268 alpha: 1]; 
    CGFloat baseColorRGBA[4]; 
    [baseColor getRed: &baseColorRGBA[0] green: &baseColorRGBA[1] blue: &baseColorRGBA[2] alpha: &baseColorRGBA[3]]; 

    UIColor* upperColor = [UIColor colorWithRed: (baseColorRGBA[0] * 0.8 + 0.2) green: (baseColorRGBA[1] * 0.8 + 0.2) blue: (baseColorRGBA[2] * 0.8 + 0.2) alpha: (baseColorRGBA[3] * 0.8 + 0.2)]; 
    UIColor* lowerColor = [UIColor colorWithRed: (baseColorRGBA[0] * 0.9) green: (baseColorRGBA[1] * 0.9) blue: (baseColorRGBA[2] * 0.9) alpha: (baseColorRGBA[3] * 0.9 + 0.1)]; 
    UIColor* lightUpColor = [UIColor colorWithRed: (baseColorRGBA[0] * 0.5 + 0.5) green: (baseColorRGBA[1] * 0.5 + 0.5) blue: (baseColorRGBA[2] * 0.5 + 0.5) alpha: (baseColorRGBA[3] * 0.5 + 0.5)]; 
    UIColor* lightDownColor = [UIColor colorWithRed: (baseColorRGBA[0] * 0.8) green: (baseColorRGBA[1] * 0.8) blue: (baseColorRGBA[2] * 0.8) alpha: (baseColorRGBA[3] * 0.8 + 0.2)]; 

    //// Gradient Declarations 
    NSArray* buttonGradientColors = [NSArray arrayWithObjects: 
            (id)upperColor.CGColor, 
            (id)lowerColor.CGColor, nil]; 
    CGFloat buttonGradientLocations[] = {0, 1}; 
    CGGradientRef buttonGradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef)buttonGradientColors, buttonGradientLocations); 
    NSArray* overlayGradientColors = [NSArray arrayWithObjects: 
             (id)lightUpColor.CGColor, 
             (id)[UIColor clearColor].CGColor, nil]; 
    CGFloat overlayGradientLocations[] = {0, 1}; 
    CGGradientRef overlayGradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef)overlayGradientColors, overlayGradientLocations); 
    NSArray* gradientColors = [NSArray arrayWithObjects: 
           (id)lightUpColor.CGColor, 
           (id)lightDownColor.CGColor, nil]; 
    CGFloat gradientLocations[] = {0, 1}; 
    CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef)gradientColors, gradientLocations); 

    //// Shadow Declarations 
    UIColor* buttonShadow = [UIColor blackColor]; 
    CGSize buttonShadowOffset = CGSizeMake(0.1, 1.1); 
    CGFloat buttonShadowBlurRadius = 2; 
    UIColor* textShadow = [UIColor blackColor]; 
    CGSize textShadowOffset = CGSizeMake(0.1, -0.1); 
    CGFloat textShadowBlurRadius = 5; 

    //// Abstracted Attributes 
    NSString* textContent = @"Update"; 


    //// Back Rectangle Drawing 
    UIBezierPath* backRectanglePath = [UIBezierPath bezierPathWithRoundedRect: CGRectMake(48, 53, 120, 23) cornerRadius: 4]; 
    CGContextSaveGState(context); 
    CGContextSetShadowWithColor(context, buttonShadowOffset, buttonShadowBlurRadius, buttonShadow.CGColor); 
    CGContextBeginTransparencyLayer(context, NULL); 
    [backRectanglePath addClip]; 
    CGContextDrawLinearGradient(context, gradient, CGPointMake(108, 53), CGPointMake(108, 76), 0); 
    CGContextEndTransparencyLayer(context); 
    CGContextRestoreGState(context); 



    //// Rounded Rectangle Drawing 
    UIBezierPath* roundedRectanglePath = [UIBezierPath bezierPathWithRoundedRect: CGRectMake(49, 54, 118, 21) cornerRadius: 3]; 
    CGContextSaveGState(context); 
    [roundedRectanglePath addClip]; 
    CGContextDrawLinearGradient(context, buttonGradient, CGPointMake(108, 54), CGPointMake(108, 75), 0); 
    CGContextRestoreGState(context); 


    //// Overlay Drawing 
    UIBezierPath* overlayPath = [UIBezierPath bezierPathWithRoundedRect: CGRectMake(48, 53, 120, 23) cornerRadius: 4]; 
    CGContextSaveGState(context); 
    [overlayPath addClip]; 
    CGContextDrawRadialGradient(context, overlayGradient, 
           CGPointMake(54.72, 38.09), 10, 
           CGPointMake(108, 11.46), 102.2, 
           kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation); 
    CGContextRestoreGState(context); 


    //// Text Drawing 
    CGRect textRect = CGRectMake(55, 54, 104, 21); 
    UIBezierPath* textPath = [UIBezierPath bezierPathWithRect: textRect]; 
    CGContextSaveGState(context); 
    CGContextSetShadowWithColor(context, textShadowOffset, textShadowBlurRadius, textShadow.CGColor); 
    CGContextBeginTransparencyLayer(context, NULL); 
    [textPath addClip]; 
    CGContextDrawLinearGradient(context, buttonGradient, CGPointMake(107, 54), CGPointMake(107, 75), 0); 
    CGContextEndTransparencyLayer(context); 
    CGContextRestoreGState(context); 

    [strokeColor setStroke]; 
    textPath.lineWidth = 1; 
    [textPath stroke]; 
    CGContextSaveGState(context); 
    CGContextSetShadowWithColor(context, textShadowOffset, textShadowBlurRadius, textShadow.CGColor); 
    [[UIColor whiteColor] setFill]; 
    [textContent drawInRect: textRect withFont: [UIFont boldSystemFontOfSize: [UIFont systemFontSize]] lineBreakMode: NSLineBreakByWordWrapping alignment: NSTextAlignmentCenter]; 
    CGContextRestoreGState(context); 



    //// Cleanup 
    CGGradientRelease(buttonGradient); 
    CGGradientRelease(overlayGradient); 
    CGGradientRelease(gradient); 
    CGColorSpaceRelease(colorSpace); 

    NSLog(@"drawRect exit"); 



} 


@end 

Answer 1

当使用故事板时，您不需要实现initWithFrame:。 事实上，故事板将使用initWithCoder:，所以它甚至不会被调用。

我测试了你的代码，它工作正常，但是，你并没有画在左上角，而是在视图中间的某个地方，所以如果你想看到你的视图，一定要使视图足够大按钮。

最好绘制在左上角。