Question

我的自定义UIView没有触发此操作，但我触发它的其他自定义视图。有谁知道这种自动刷新视图的原因是什么？或者为什么＆＃34;刷新所有视图＆＃34;是灰色的。

代码在这里： https://github.com/HannahCarney/HCRotaryWheel

Answer 1

确保您的视图具有IBInspectable属性。（喜欢更改您的视图颜色，只是为了确保您的IBDesignable事物作品）。
确保您在视图.m

文件。（在你的视图中绘制rect方法）。

确保您提供IBDesignable视图的文件所有者名称。（在您的storyboarD中）
请务必在您的视图.h文件中提及IB_DESIGNABLE。
最后一个qucik清理和构建你的故事板，应启用
刷新所有视图的选项。

示例代码：

for view.h

#import <UIKit/UIKit.h>

IB_DESIGNABLE


@interface designalble_UIView : UIView

@property (nonatomic) IBInspectable UIColor *startColor;
@property (nonatomic) IBInspectable UIColor *midColor;
@property (nonatomic) IBInspectable UIColor *endColor;
@property (nonatomic) IBInspectable NSInteger borderWidth;
@property (nonatomic) IBInspectable CGFloat cornerRadious;
@property (nonatomic) IBInspectable BOOL isHorizontal;


@end

for view.m

#import "designalble_UIView.h"

@implementation designalble_UIView

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {

        self.startColor     = [UIColor redColor];
        self.midColor       = [UIColor greenColor];
        self.endColor       = [UIColor blueColor];
        self.borderWidth    = 2;
        self.cornerRadious  = 10;
        self.isHorizontal   = NO;

        [self customInit];
    }
    return self;
}

- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        [self customInit];
    }
    return self;
}


- (void)drawRect:(CGRect)rect {
    [self customInit];
}

- (void)setNeedsLayout {
    [super setNeedsLayout];
    [self setNeedsDisplay];
}


- (void)prepareForInterfaceBuilder {

    [self customInit];
}

- (void)customInit {


    self.layer.cornerRadius = self.cornerRadious;
    self.layer.borderWidth = self.borderWidth;

    if (self.cornerRadious > 0) {
        self.layer.masksToBounds = YES;
    }


    CAGradientLayer *gradient = [CAGradientLayer layer];
    gradient.frame = self.bounds;

    gradient.colors = [NSArray arrayWithObjects:(id)[self.startColor CGColor],(id)[self.midColor CGColor], (id)[self.endColor CGColor], nil];
    gradient.endPoint = (self.isHorizontal) ? CGPointMake(1, 0) : CGPointMake(0, 1);
    [self.layer insertSublayer:gradient atIndex:0];

}

Answer 2

我解决了这个问题，因为我把IB_DESIGNABLE放在我的代码中的错误位置：

我的视图顶部有一个协议，之前看起来像是

IB_DESIGNABLE

@protocol RotaryProtocol <NSObject>

- (void) wheelDidChangeValue:(int)currentSector;
@end

@interface HCRotaryWheel : UIView

@property (weak) id <RotaryProtocol> delegate;
@property (nonatomic, strong) IBInspectable UIColor* background;

@end

要解决这个问题，我必须将IB_DESIGNABLE移到协议下面

@protocol RotaryProtocol <NSObject>

- (void) wheelDidChangeValue:(int)currentSector;
@end

IB_DESIGNABLE

@interface HCRotaryWheel : UIView

@property (weak) id <RotaryProtocol> delegate;
@property (nonatomic, strong) IBInspectable UIColor* background;

@end

现在我的观点刷新!!

如何让自动刷新视图生效？

2 个答案: