Question

请参阅此处的代码

@interface StaticView : UIView {
    Properties *prop;
}
@property (retain) Properties *prop;
@end

我正在通过代码附加此视图

[super viewDidLoad];
StaticView *sView = [[StaticView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
sView.prop.glowIntensity = 0.85f;

[self.view addSubview:sView];

但是在我的staticView的drawRect方法中，我总是得到prop.glowIntensity = 0.0000

- (void)drawRect:(CGRect)rect {
        NSLog(@"%f", prop.glowIntensity);
}

这是我的Properties.h

@interface Properties : NSObject {
    UIColor *bgColor;
    UIColor *foreColor;
    float glowIntensity;
}
@property(retain) UIColor *bgColor;
@property(retain) UIColor *foreColor;
@property float glowIntensity;

-(void) initbgColor:(UIColor *)bgC foreColor:(UIColor *)fC glowIntensity:(float) gI;
@end

这里是实现Properties.m

#import "Properties.h"

@implementation Properties

@synthesize bgColor;
@synthesize foreColor;
@synthesize glowIntensity;

-(void) initbgColor:(UIColor *)bgC foreColor:(UIColor *)fC glowIntensity:(float) gI
{
    self.bgColor = bgC;
    self.foreColor = fC;
    self.glowIntensity = gI;

}
@end

如何将正确的值传递给我的StaticView类？

Answer 1

尝试将代码更改为：

@property (assign) float glowIntensity;        // We don't want to retain the float like done by default (at least I think it's default)

- (void)initWithBgColor:(UIColor *)bgC foreColor:(UIColor *)fC glowIntensity:(float)gI {
    if (self = [super init]) {        // We need to init self
        bgColor = bgC;                // Don't use the accessors in -init
        foreColor = fC;
        glowIntensity = gI;
    }
}

编辑：我认为弗拉基米尔也是对的。

Answer 2

在使用它之前看起来你没有创建或设置你的视图的prop变量 - 默认情况下它等于nil并且在nil对象上调用glowIntensity只返回0。

将对象值传递给UIView

2 个答案: