xcode定义变量问题
有人可以向我解释一下为什么我的名为 Activity 的变量在定义为 float 时为 0，但在定义为 int 时显示正确的值？我还有另一个浮标，它的用途几乎相同，但效果很好！
@implementation AppPrefsViewController
float age;
int activity;
...
-(void) updateAValues{
if (selectedActivityUnit == 0){
activity = 50;
NSLog(@"activity = %d",activity);
}
if (selectedActivityUnit == 1){
activity = 75;
NSLog(@"activity = %d",activity);
}
}
....
- (void)updateLabel {
if (selectedUnit == 0) {
subView.hidden = YES;
age = 1;
NSLog(@"age = %d",age);
}
if (selectedUnit == 1) {
subView.hidden = YES;
age = 2;
NSLog(@"age = %d",age);
}
if (selectedUnit == 2) {
subView.hidden = NO;
age = 3;
NSLog(@"age = %d",age);
}
}
Can someone please explain to me why my variable called activity is 0 when defined as a float, but displays the correct value when defined as an int? I have another float which is used for pretty much the same thing but works perfectly!
@implementation AppPrefsViewController
float age;
int activity;
...
-(void) updateAValues{
if (selectedActivityUnit == 0){
activity = 50;
NSLog(@"activity = %d",activity);
}
if (selectedActivityUnit == 1){
activity = 75;
NSLog(@"activity = %d",activity);
}
}
....
- (void)updateLabel {
if (selectedUnit == 0) {
subView.hidden = YES;
age = 1;
NSLog(@"age = %d",age);
}
if (selectedUnit == 1) {
subView.hidden = YES;
age = 2;
NSLog(@"age = %d",age);
}
if (selectedUnit == 2) {
subView.hidden = NO;
age = 3;
NSLog(@"age = %d",age);
}
}
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您正在使用
来显示您的价值观。如果 Activity 是 int 类型，则此方法有效，因为 %d 用于显示 int。如果要显示浮点数，则需要浮点数格式化程序 %f，如下所示：
You're using
To display your values. This works if activity is an int type as %d is for displaying ints. If you want to display floats you need the float formater %f, as in: