[問題] cs193p 程式問題

[angelina877 (牛牛)]

https://www.youtube.com/watch?v=ZqKbN_C4Yvg
課程影片約55分處

#import "TextStatsColorAndOutlineViewContrller.h"
@interface TextStatsColorAndOutlineViewContrller()
@property (weak, nonatomic) IBOutlet UILabel *colorfulCharacterLabel;
@property (weak, nonatomic) IBOutlet UILabel *outlineCharacterLabel;

@end

@implementation TextStatsColorAndOutlineViewContrller

-(void)setTextToAnalyze:(NSAttributedString *)textToAnalyze
{
    _textToAnalyze = textToAnalyze;
    if (self.view.window) [self updateUi];//如果是nil就不出現在螢幕上
}

-(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [self updateUi];
}

-(void) updateUi
{
    self.colorfulCharacterLabel.text = [[self characterWithAttribute:NSForegroundColorAttributeName] length];
    self.outlineCharacterLabel.text = [[self characterWithAttribute:NSForegroundColorAttributeName] length];
}

-(NSAttributedString *)characterWithAttribute:(NSString *)attributeName
{
    NSMutableAttributedString *characters = [[NSMutableAttributedString alloc ] init ];

    int index = 0;
    while (index < [self.textToAnalyze length]) {
        NSRange range;
        id value = [self.textToAnalyze attribute:attributeName atIndex:index effectiveRange: &range];
        if (value) {
            [characters appendAttributedString:[self.textToAnalyze attributedSubstringFromRange:range]];
            index = range.location + range.length;
            }
        else{
            index++;
        }
    }
    return characters;

}


警告訊息：
在index = range.location + range.length;這一行

implicit conversion loses integer precision 'unsigned long' to 'int'

我的Code都照打
怎麼還是會有warninghttps://www.youtube.com/watch?v=ZqKbN_C4Yvg
課程影片約55分處

#import "TextStatsColorAndOutlineViewContrller.h"
@interface TextStatsColorAndOutlineViewContrller()
@property (weak, nonatomic) IBOutlet UILabel *colorfulCharacterLabel;
@property (weak, nonatomic) IBOutlet UILabel *outlineCharacterLabel;

@end

@implementation TextStatsColorAndOutlineViewContrller

-(void)setTextToAnalyze:(NSAttributedString *)textToAnalyze
{
    _textToAnalyze = textToAnalyze;
    if (self.view.window) [self updateUi];//如果是nil就不出現在螢幕上
}

-(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [self updateUi];
}

-(void) updateUi
{
    self.colorfulCharacterLabel.text = [[self characterWithAttribute:NSForegroundColorAttributeName] length];
    self.outlineCharacterLabel.text = [[self characterWithAttribute:NSForegroundColorAttributeName] length];
}

-(NSAttributedString *)characterWithAttribute:(NSString *)attributeName
{
    NSMutableAttributedString *characters = [[NSMutableAttributedString alloc ] init ];

    int index = 0;
    while (index < [self.textToAnalyze length]) {
        NSRange range;
        id value = [self.textToAnalyze attribute:attributeName atIndex:index effectiveRange: &range];
        if (value) {
            [characters appendAttributedString:[self.textToAnalyze attributedSubstringFromRange:range]];
            index = range.location + range.length;
            }
        else{
            index++;
        }
    }
    return characters;

}


警告訊息：
在index = range.location + range.length;這一行

implicit conversion loses integer precision 'unsigned long' to 'int'

我的Code都照打
怎麼還是會有warning....
不解ＱＱ

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→ Esvent: 因為編譯的環境不同 arm64的NSInteger是long 之前是int
→ Esvent: 啊說錯 之前也是long 不過arm64的long是8byte 其他4byte
→ Esvent: 詳細可以參考Apple的document https://goo.gl/t4Oiwe
→ Esvent: 32位元 long(4byte) <=> int(4byte) 長度相同 可直接轉換
→ Esvent: 64位元 long(8byte) <=> int(4byte) 長度不同 會掉資訊