在初始化時向UIView添加子視圖

Question

在UIView子類的初始化方法中，我添加了幾個UIImageViews。渲染視圖時，它們出現在subviews數組中，並且具有有效的框架矩形，但不在屏幕上繪製。有誰知道爲什麼發生這種情況？

- (id) initWithFrame:(CGRect)frame { 

    self = [super initWithFrame:frame]; 
    if (!self) 
     return nil; 

    [self commonInit]; 

    return self; 

} 

- (void) commonInit { 

    _padding = 128.0f; 

    // Add the chord views here 


    _chordImages = [NSArray arrayWithObjects:[UIImage imageNamed:@"fn_maj_x_x_x_x_1_e_1_fn"], [UIImage imageNamed:@"en_maj_x_x_x_x_1_e_1_en"], [UIImage imageNamed:@"dn_maj_x_x_x_x_1_d_1_f#"], [UIImage imageNamed:@"an_min_x_x_x_x_1_a_1_en"], nil]; 

    CGFloat containerWidth = [self bounds].size.width; 
    NSLog(@"containerWidth: %f",containerWidth); 
    CGFloat chordWidth = [[_chordImages objectAtIndex:0] size].width; 
    NSLog(@"chordWidth: %f",chordWidth); 
    CGFloat chordMarkerWidth = [[[GVChordMarkerView alloc] initWithFrame:CGRectMake(0, 0, 12, 12)] frame].size.width; 
    NSLog(@"chordMarkerWidth: %f",chordMarkerWidth); 

// [self setFrame:CGRectMake(chordXPosition, 0, [self bounds].size.width, [self bounds].size.height]); 

    CGFloat chordXPosition = 0; 
    CGFloat chordXSpacing = (containerWidth/4 - (chordMarkerWidth + chordWidth)); 
    chordXPosition += containerWidth/4; 

    for (NSUInteger i = 0; i < [_chordImages count]; i++) { 
     chordXPosition += chordXSpacing; 
     CGRect chordImageViewFrame = CGRectMake(chordXPosition, 0, [[_chordImages objectAtIndex:0] size].width, [[_chordImages objectAtIndex:0] size].height); 
     UIImageView *chordImageView = [[UIImageView alloc] initWithFrame:chordImageViewFrame]; 
     [self addSubview:chordImageView]; 
     chordXPosition += (chordMarkerWidth + chordWidth); 
    } 
    NSLog(@"Finished"); 
} 

Answer 1

難道你的UIImageview只是空的嗎？你在哪裏添加圖片？